Can someone help me with my practice test?

Answer:

The expression 6c + 4d - c - 7d can be simplified by combining like terms. 6c + 4d - c - 7d = (6c - c) + (4d - 7d) Simplifying further, we get: 6c + 4d - c - 7d = 5c - 3d So the simplified expression is 5c - 3d.

To simplify the expression 6c + 4d - c - 7d, we can first combine the like terms, which are the terms that have the same variable and the same exponent:

6c - c + 4d - 7d

Simplifying this expression further by combining the like terms, we get:

5c - 3d

Therefore, 6c + 4d - c - 7d simplifies to 5c - 3d.

Bo would drive 893 miles on 38 gallons of fuel.The number of miles driven by Bo is directly proportional to the number of gallons of fuel he has used.

This means that if we know how many miles Bo has driven for a certain number of gallons of fuel, we can calculate how many miles he would drive with a different number of gallons of fuel. To calculate this, we need to first determine the ratio of miles driven per gallon of fuel used. To do this, we can use the data given in the problem: Bo has driven 188 miles on 8 gallons of fuel, and 799 miles on 34 gallons of fuel.

We can calculate the ratio of miles driven per gallon of fuel used by dividing the number of miles driven by the number of gallons used. In this case, the ratio is 188/8 = 23.5 miles per gallon. We can then use this ratio to calculate the number of miles Bo would drive on 38 gallons of fuel. To do this, we simply multiply the ratio by the number of gallons used, which in this case is 38. This gives us 38 x 23.5 = 893 miles.

Therefore, Bo would drive 893 miles on 38 gallons of fuel.

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Answer:

whaaaaaaaaa..........

......

3. x = 148°

4. x = 142°

5. x = 29.33°

6. x = -0.4 which is wrong data

Angles are geometric figures formed by two rays that share a common endpoint. This common endpoint is called the vertex of the angle.

3. Adjacent angles sum is 180°

So, x + 32° = 180°

x = 148°

4. Vertical opposite angles are equal,

So, x = 142°

5. Right angle, So, Adjacent angles sum is 90°

3x + 2x = 90°

5x = 90°

x = 29.33°

6. Vertical opposite angles are equal,

So, x - 2 = 6x

5x = -2

x = -0.4   which is wrong data

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The proportion of the pool that will be filled when the first pump works for 2 hours and the second pump works for 3 hours is given as follows:

100%.

The fraction of the pool that will be filled when the first pump works for 2 hours and the second pump works for 3 hours is obtained applying the proportions in the context of the problem.

One pump can fill a swimming pool in 4 hours, hence the proportion filled in two hours is given as follows:

2/4 = 50%.

A second pump can fill the pool in 6 hours, hence the proportion filled in three hours is given as follows:

3/6 = 50%.

Then the total proportion is given as follows:

50 + 50 = 100%.

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In system equation method,

a) Amount of red portion = 240 ml.

b) There are 300 mL of blue potion used and 100 mL of red potion used.

c)  There is a ratio of 2 (blue potion):1 (red potion), there will be a 35% amount of magical syrup.

What is equation?

The definition of an equation in algebra is a mathematical statement that demonstrates the equality of two mathematical expressions. For instance, the equation 3x + 5 = 14 consists of the two equations 3x + 5 and 14, which are separated by the 'equal' sign.

(a)  We can use a system equation here to solve this.

Let x=amount of red potion used

Let y=total amount of potion in solution

Then,

=>200 + x =  y

=> 0.15(200) + 0.75x = 0.25y

0.15(200) because 15% of the blue potion=.15 and there is 200mL.

0.75x because 75% of the red potion=.75 and there is x amount of it

0.25y because we want 25% of the total potion=.25 and there is y amount of it.

We can substitute for y in the second equation:

=>0.15(200) + 0.75x = 0.25(200 + x)

=> 30 + 0.75x = 50 + 0.25x

=> -20 = -0.5x

=> x = 40

Knowing that x=40, we know that y=240, meaning our answer is 240.

b.) We can again use a system for this problem

Let x=Amount of red potion

Let y=Amount of blue potion

=> x + y = 400

=> 0.3(400) = 0.15y + 0.75x

0.3(400)=30% of the 400 mL

0.15y=15% of the magic syrup

0.75x=75% of the magic syrup

We can substitute for x in this equation:

=>120 = 0.15y + 0.75(400 - y)

120 = 0.15y + 300 - 0.75y

-180 = -0.6y

y = 300, x = 100

There are 300 mL of blue potion used and 100 mL of red potion used.

c.) Let x=amount of red potion

Let y=amount of blue potion

=> 0.15x + 0.75y = 0.35(x + y)

0.35(x+y) because the total amount of the potion is x+y

=>0.15x + 0.75y = 0.35x + 0.35y

0.4y = 0.2x

2y = x

Whenever there is a ratio of 2 (blue potion):1 (red potion), there will be a 35% amount of magical syrup.

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9 kilom-eters, is Bloomin-gton from Reag-an's house, measured in a str-aight line.

"A method to find a single unit value from a multiple unit value and to find a multiple unit value from a single unit value."

We always count the unit or amount value first and then calculate the more or less amount value.

For this reason, this procedure is called a unified procedure.

Many set values ​​are found by multiplying the set value by the number of sets.

A set value is obtained by dividing many set values ​​by the number of sets.

=29-20

=9 km

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With the equation solved, we obtain variable x=-3.

Equations are statements in mathematics containing the equals (=) sign flanked on either side by two algebraic expressions. The connection between the phrases displayed on the left and right sides is shown to be equal in this way. In all mathematical equations, LHS = RHS (left hand side = right hand side) is used. Solving the equations to get the value of an unknown variable that stands in for an unknown quantity.

Given equation: 4⁻²ˣ × 4ˣ=64

Let 4ˣ be y

y⁻² × y=64

Solving the equation, we get

y/y²=64

y=1/64

Putting the value of y, we get

4ˣ=1/64

4ˣ=4⁻³

Hence, value of x=-3.

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The number of expected double crossover progeny when multiply by the total number of progeny is 47.

When chromosomal pieces are swapped out twice, it is known as a double crossover. In the case of a double crossing, the two ends of the chromosome are still parental, but another sister chromatid sequence has "swapped" into the space between the crossovers;

When homologous chromosomes are combined, crossovers happen.

Chromatids from various chromosomes can be aligned. Exchange chromatids from, for example, segments a collision between two identical chromosomes occurs at an similar spot along their respective lengths. they are After swapping the segments, the chromatids have split between the point of contact and the chromatids' tips.

We have,

number of double crossovers is 0.305 x 0.155 x 1000

so 0.305 x 0.155 x 1000 = 47

So number of expected double crossover progeny is 47.

Test cross:

Progeny whithered wing smooth body and speck body

Genetic distance between sm and sp is 15.5

15.5 = 2x + 33 /1000 x 100

155 = 2x + 33

2x = 155-33

x = 122/2

x = 61.

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Answer: 70%

Step-by-step explanation:

make x=the percent of the discount.

$1,920 x=$1,344

           x =$1,344÷ $1,920

           x =0.7 or 70%

The total earnings of the worker under the Halsey Premium Plan is ₹1500 and under the Rowan Plan is ₹2250. the worker is paid for the actual time taken for the job.

(i) Halsey Premium Plan (Rate 50%)Under the Halsey Premium Plan, for a given job, the worker is paid 50% of the standard time allotted for the job. The rate per hour is ₹75. The total earnings of the worker can be calculated as follows: Earnings = (Standard Time Allotted x Rate per Hour x 50%) = (40 hours x ₹75 x 50%) = ₹1500 (ii) Rowan PlanUnder the Rowan Plan, for a given job, the worker is paid for the actual time taken for the job. The rate per hour is ₹75. The total earnings of the worker can be calculated as follows: Earnings = (Actual Time Taken x Rate per Hour) = (30 hours x ₹75) = ₹2250In conclusion, the total earnings of the worker under the Halsey Premium Plan is ₹1500 and under the Rowan Plan is ₹2250.

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The surface area of the figure in item 14 is given as follows:

1112.8 mm².

The surface area of a rectangular prism of height h, width w and length l is given by:

S = 2(hw + lw + lh).

This means that the area of each rectangular face of the prism is calculated, and then the surface area is given by the sum of all these areas.

The figure in item 14 is composed as follows:

Hence the surface area of the figure is given as follows:

S = 5 x 13 x 13 + 4 x 0.5 x 10.3 x 13

S = 1112.8 mm².

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Answer:

  9000 feet altitude

Step-by-step explanation:

Given that the y-value for this situation represents altitude in thousands of feet, you want to know what the y-value of the point of intersection represents.

The problem statement tells you the meaning of the y-value anywhere. It is "altitude in thousands of feet."

The point of intersection is (2, 9), where the x-value is time in minutes.

The y-value of 9 at the point of intersection represents an altitude of 9000 feet.

__

Additional comment

This  is an exercise in reading comprehension.

Answer:

1: 9

2: 16

3: 225

4: 196

5: 25

6: 256

Step-by-step explanation:

Math :)

The probability of the student's name being drawn first is 1/3.

The probability that you and your two friends will be chosen, but your name will be drawn first is 1/3.The likelihood or chance of a specific event happening is referred to as probability. The probability of an event is represented by a number between 0 and 1, with 0 indicating that the event will never occur, and 1 indicating that the event will always occur.

Probability formula the probability of an event occurring is calculated by dividing the number of favorable outcomes by the total number of possible outcomes. Probability (P) = number of favorable outcomes/total number of possible outcomes.Probability of the scenario The total number of people who can be picked is three, with one of them being the student.

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Answer:

Let's assume that the width of the rectangle is 'w' meters.

According to the problem, the length of the rectangle is three times its width, so the length is:

l = 3w

The area of the rectangle is given as 300 m², so we have:

lw = 300

Substituting the value of 'l' in terms of 'w', we get:

(3w)w = 300

Simplifying the above equation, we get:

3w^2 = 300

Dividing both sides by 3, we get:

w^2 = 100

Taking the square root on both sides, we get:

w = 10

So the width of the rectangle is 10 meters.

Using the value of 'w', we can find the length of the rectangle:

l = 3w = 3(10) = 30

So the length of the rectangle is 30 meters.

The perimeter of the rectangle is given by:

P = 2(l + w)

Substituting the values of 'l' and 'w', we get:

P = 2(30 + 10) = 2(40) = 80

Therefore, the perimeter of the rectangle is 80 meters.

Step-by-step explanation:

There are 84 calories from alcohol in a margarita containing 12 grams of alcohol.

What is Algebraic expression ?

Algebraic expression can be defined as combination of variables and constants.

The formula to calculate the calories from alcohol in a drink is:

Calories from alcohol = (Grams of alcohol) x (7 calories per gram)

Therefore, to calculate the calories from alcohol in a margarita containing 12 grams of alcohol, we use this formula:

Calories from alcohol = 12 grams x 7 calories/gram = 84 calories

Therefore, there are 84 calories from alcohol in a margarita containing 12 grams of alcohol.

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The volume of the cylinder is 6π (18.84) cubic inches.

What is volume in mensuration ?

In mensuration, volume is the measure of the amount of space occupied by a three-dimensional object or a region in space. It is a measure of the capacity of an object and is usually expressed in cubic units, such as cubic meters, cubic centimeters, or cubic inches.

To understand the concept of volume in more detail, we can visualize the cylinder as a three-dimensional object with circular bases and curved sides. The height of the cylinder represents the distance between the circular bases, and the radius represents the distance from the center of the circular bases to their edges. The volume of the cylinder represents the amount of space inside the cylinder, and can be thought of as the product of the area of the circular base and the height of the cylinder.

To find the volume of a cylinder, we use the formula:

V = πr²h

where V is the volume, r is the radius, and h is the height of the cylinder. Since the diameter of the cylinder is given as 2 inches, we can find the radius as:

radius = diameter / 2 = 2 / 2 = 1 inch

Now, we can substitute the values of the radius and height into the formula to find the volume:

V = π(1)²(6) = 6π

Therefore, the volume of the cylinder is 6π cubic inches.

In practical applications, the concept of volume is used in many areas, such as manufacturing, engineering, architecture, and physics. For example, the volume of a cylinder can be used to calculate the amount of liquid it can hold, the amount of material needed to fill it, or the amount of air it can displace.

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The statement "two proofs are required to establish the provable equivalence of two sentences of tfl" is false.

Only one proof is required to establish the provable equivalence of two sentences of TFL.

What is TFL? TFL (Truth-Functional Logic) is a form of propositional logic in which the only logical expressions are truth functions. Truth functions are built from a fixed set of truth-functional connectives or operators, each of which operates on one or more sentences to create a compound sentence. TFL's operators are all truth-functional; that is, the truth or falsity of a sentence depends solely on the truth or falsity of its atomic components and how they are combined by the operators.

Here are the five standard truth-functional operators in TFL:

Conjunction: AND (•)

Disjunction: OR (+)

Negation: NOT (~)

Conditional: IF...THEN (→)

Biconditional: IF AND ONLY IF (↔)

Proofs are used to demonstrate the validity of sentences in TFL. It is important to note that a sentence's validity is a property of the sentence itself, not the sentence's meaning. To demonstrate the validity of a sentence in TFL, proofs are created.In TFL, two sentences are provably equivalent if and only if they are logically equivalent. The provable equivalence of two sentences in TFL only requires one proof. Thus, the statement, "Two proofs are required to establish the provable equivalence of two sentences of TFL," is false.

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So, there are 18 possible outcomes in the sample space.

In probability theory, the sample space of an experiment is the set of all possible outcomes that can occur. It is denoted by the symbol S and represents the total set of possible results that can be obtained from a given experiment.

For example, when rolling a standard six-sided die, the sample space is {1, 2, 3, 4, 5, 6}, because those are the only possible outcomes of the experiment. Similarly, when flipping a coin, the sample space is {heads, tails}.

The sample space is an essential concept in probability theory because it helps to determine the likelihood or probability of various outcomes occurring in a given experiment.

Here's the tree diagram for the given problem:

markdown

Copy code

        Lunch

           /     |      \

    Soup Salad Sandwich

    /              |         |    

Tortellini Lentil     Caesar

                          /          |      \

               Roast Beef Ham   Turkey

The possible outcomes in the sample space are all the combinations of soup, salad, and sandwich.

There are 2 options for soup (Tortellini, Lentil), 3 options for salad (Caesar, Macaroni, Garden), and 3 options for sandwich (Roast Beef, Ham, Turkey). Therefore, the total number of possible outcomes in the sample space is:

2 x 3 x 3 = 18

So, there are 18 possible outcomes in the sample space.

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The amount of salt in the tank 10 minutes after the process begins is 9.6 pounds.

As per the given information,

a tank with a capacity of 100 gallons initially contains 50 gallons of water with 10 pounds of salt in solution. Freshwater enters at a rate of 2 gallons per minute and a well-stirred mixture is pumped out at the same rate. Compute the amount of salt (in pounds) in the tank 10 minutes after the process begins.

We know that

Amount of salt in the tank = Salt concentration x Volume of water

Amount of salt at t = 0 in the tank = 10 pounds

Volume of water at t = 0 in the tank = 50 gallons

Amount of salt at time t in the tank can be calculated by the following formula.

Amount of salt in the tank at time t = (Amount of salt at t = 0) - (Freshwater enters at rate × Salt concentration in the tank)

Now, let's calculate the amount of salt in the tank after 10 minutes.

Calculate the volume of water in the tank after 10 minutes

The rate of freshwater enters into the tank is 2 gallons per minute

So, the volume of water that entered the tank in 10 minutes = 2 × 10 = 20 gallons

Initial volume of water in the tank = 50 gallons

Volume of water in the tank after 10 minutes

= Initial volume + Freshwater enters - Freshwater pumped out

= 50 + 20 - 20

= 50 gallons

Calculate the salt concentration in the tank after 10 minutes.

Initially, the salt concentration = (Amount of salt at t = 0) / (Volume of water at t = 0) = 10/50 = 0.2 lbs/gallon

Now, the amount of salt at time t = 10 min = 10 - 2 × 0.2 = 9.6 lbs

So, the salt concentration after 10 minutes = 9.6 / 50 = 0.192 lbs/gallon

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The missing length w of the given trapezium with the area of  128.885 cm² is found to be: w = 14.9 cm.

A closed-form, two-dimensional quadrilateral with two parallel, opposite sides is called a trapezium. The bases and legs of a trapezium are referred to as parallel and non-parallel, respectively. Four sides as well as four corners make up the trapezium.

The term "isosceles trapezium" refers to a trapezium with equal-length legs, meaning that the 2 non parallel sides are equal.

Area of Trapezium =  ½ (Sum of parallel sides) × (Height between parallel sides)

128.885  =  ½(5.3 + 12) × w

128.885 * 2  =  17.3 w

w = 128.885 * 2 / 17.3

w = 14.9

Thus, the missing length w of the given trapezium with the area of  128.885 cm² is found to be: w = 14.9 cm.

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Step-by-step explanation:

1)  x^2 - 4x + 1

   re-arrange into   vertex form  y = a ( x-h)^2 + k    where h, k is the vertex

y =    (x^2 -4x) +1     'complete the square'  

                 ( take 1/2 of x coeff square it and add and subtract it )

       (x^2 - 4x +4)  - 4    + 1     reduce it

y=      (x-2)^2  -3         shows vertex is  2, -3

    Back to original equation  

   x^2 -4x + 1        using Quadratic Formula   x = 2 ± sqrt (3)  = 3.73 and .268

   line of symmetry = x value of vertex    x = 2

Range  is     -3 ≤ y ≤ + ∞

  domain is   - ∞  ≤  x  ≤ + ∞

2)   Similar to above....try it yourself

Answer:

In GeoGebra, m∠EAD = 120°. Both m∠ADC and m∠AEC are 90° because the tangent to a circle is perpendicular to the radius drawn from the point where the tangent touches the circle.

Step-by-step explanation:

plato :>

The ramp will rise 16.8 inches from the ground at its highest end, when the angle of elevation is 19 degrees and the length of the fiberboard is 27 inches.

To calculate the height of the ramp at its highest end:

1. First, calculate the length of the hypotenuse of the triangle formed by the ramp, using the Pythagorean Theorem. This can be done by squaring the length of the ramp (27 inches) and the angle of elevation (19 degrees) and adding them together. The result is 750.41 inches.

2. Next, take the square root of the result from step 1. This gives us 27.45 inches, which is the length of the hypotenuse.

3. Then, subtract the length of the ramp from the length of the hypotenuse. This gives us 8.45 inches.

4. Finally, divide the result from step 3 by 2. This gives us the height of the ramp at its highest end, which is 16.8 inches.

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Answer:80

Step-by-step explanation:

Area is multiple from 20 and 4 so the answer is 80

The coordinate location of the point S' is (-1.5, 4).

The scale factor of the dilation is 0.25.

To find coordinate location of the point S' after a dilation using a scale factor of 0.5 , we can use the following formula:

S' = scale factor * S

where S' is the image of S and S is the preimage. The coordinate of S is (-3, 8)

Substituting the values, we get:

S' = 0.5 * (-3, 8)

S' = (-1.5, 4)

Thus, the  coordinate location of the point S' is (-1.5, 4).

PART 2

The scale factor of the dilation is given by:

scale factor = coordinate of image / coordinate of preimage

Let's pick one of the coordinates (you can use either x or y coordinate). We pick B:

scale factor = B'/B

scale factor = 1/4 = 0.25

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Using the sine's function in the given triangle, the value of x is 75.7 respectively.

What is the triangle?

A triangle is a 3-sided polygon that is occasionally (though not frequently) referred to as the trigon.

There are three sides and three angles in every triangle, some of which may be the same.

The angle total of a triangle will always be equal to 180°.

A quadrilateral can be divided in half from corner to corner to form a triangle because the angle total of a quadrilateral is equal to 360°.

A triangle is effectively half of a quadrilateral, therefore it makes sense that its angle measurements are also half. 180° is one-half of 360°.

So, right triangles are used to depict figures like this one, which has a hypotenuse of 85, a base of x, and a top angle of 63°.

The hypotenuse and the side that faces the angle are both present.

The sine function's opposite/hypotenuse ratio is as follows:

sin 63° = x/85

Now, solve as follows:

sin 63° = x/85

85(sin 63°) = x

75.7 = x

Therefore, using the sine's function in the given triangle, the value of x is 75.7 respectively.

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Complete question:

In this triangle, what is the value of x? Enter your answer, rounded to the nearest tenth, in the box.

Option D : The equation that demonstrates the inverse property is D. 3/4 x 4/3= 1, which shows that the multiplication of the reciprocal of a number equals 1.

According to the multiplicative property known as the inverse property, the result of multiplying any non-zero number by its inverse or reciprocal will equal the multiplicative identity, which is 1.

The inverse property of multiplication states that for any non-zero number a, its inverse or reciprocal, when multiplied by a, will result in 1. The reciprocal of a number is the number that when multiplied by the original number results in 1.

For example, the reciprocal of 3 is 1/3 because 3 x 1/3 = 1.

Similarly, the reciprocal of 4/3 is 3/4 because (4/3) x (3/4) = 1.

So, if we multiply 3/4 by its reciprocal 4/3, we get:

(3/4) x (4/3) = (3 x 4) / (4 x 3) = 12 / 12 = 1

This shows that the product of 3/4 and 4/3 is 1, which is the multiplicative identity. Hence, this equation demonstrates the inverse property of multiplication.

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Which equation would demonstrate the inverse property?

A. (3x4) + (3x5) = 3(4+5)

B. 3x5 = 5x3

C. 3x4x5= (3x4)x5

D. 3/4 x 4/3= 1

Answer:

The x-intercept is (1, 0).