Mac has taken seven maths exams this year. His average mark is 78%. What mark must he get on the eighth exam to raise his average to 80%?

FromHello, Volent strawberry is here to help!

Answer: 15.0 yd2

I hope this helps!

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From: Miko

Answer:

1. Multiply the two legs of the triangle

  3 x 10 = 30

2. Divide that number by 2

  30 / 2 = 15

The area of the triangle is 15 yd2

x-x

Answer:

2/5

Step-by-step explanation:

markup / cost       =    10 /25 = 2/5

Answer:

Step-by-step explanation:

Answer:

The graph of f(x) = x² was transformed to create the graph of g(x) = f(x) + 1.5. Which statement about the graphs is true?

The vertex of the graph of g is 1.5 units to the left of

the vertex of the graph of f.

B

The y-intercept of the graph of g is 1.5 units above the

y-intercept of the graph of f.

The graph of g is a reflection of the graph of f across

the y-axis.

The graph of g is a reflection of the graph of f across

the x-axis.

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

It should be .7. Count each mark as .1 and this should be clear.

Answer:

Step-by-step explanation:

The formula for the area of a triangle gives a relationship between area, height, and base length. The problem statement gives the area, and it gives another relation between height and base length. Using these two relations, you can solve for the dimensions of the triangle.

__

The side to which the altitude is measured is called the "base" in the area formula. The altitude is called the "height." The relation between them given by the area formula is ...

  A = 1/2bh

  51 = 1/2bh . . . . . . using the given value for area

The other relation given by the problem statement is that the base is 1 less than 3 times the height:

  b = 3h -1 . . . . . . . base is 1 less than 3 times altitude

__

Using this second equation to substitute for 'b' in the first equation, we have ...

  51 = 1/2(3h -1)h

  102 = 3h² -h . . . . multiply by 2, eliminate parentheses

  3h² -h -102 = 0 . . . . . put in standard form

  3h² -18h +17h -102 = 0 . . . . . prepare to factor

  3h(h -6) +17(h -6) = 0 . . . . . factor pairs of terms

  (3h +17)(h -6) = 0 . . . . . . . . finish factoring

Solutions are the values of h that make these factors zero:

  3h +17 = 0   ⇒   h = -17/3

  h -6 = 0   ⇒   h = 6

We know that dimensions in a geometry problem must be positive, so the solution here is h = 6. Then b = 3h -1 = 3(6) -1 = 17. The dimensions are all in inches.

The length of the side is 17 inches; the altitude to that side is 6 inches.

Step-by-step explanation:

Nine sided polygon has an angle of 360/9=40 degrees at one vertex.

So the angles opposite the radius=(180–40)/2==140/2=70degrees.

solving for Base(side): 1/2s=5.cos70= 3.42 units Ans

P=9(5+3.42)=75.78 units Ans.

I search it. ‍♀️

Answer: hii

Step-by-step explanation:

Solve for x by simplifying both sides of the equation, then isolating the variable.

Hopefully this helps you

- Matthew

Answer:

c=-1

Step-by-step explanation:

Multiply both sides by 4

[tex]\frac{-11c-35}{4}\cdot \:4=4c\cdot \:4-2\cdot \:4[/tex]

Simplify

[tex]-11c-35=16c-8[/tex]

Add 35 to both sides

[tex]-11c-16c=16c+27-16c[/tex]

Simplify

-27c=27

Divide both sides by 27

[tex]\frac{-27c}{-27}=\frac{27}{-27}[/tex]

Simplify

c= -1

mark brainliest please!

Answer:

819 is the answer

Step-by-step explanation:

formula for volume is LxWxH

since volume is length * width * height, the volume for this will be 9 * 7 * 13 = 819cm^3

Answer:

Step-by-step explanation:

1:30

Answer:

125 ft/hr

Step-by-step explanation:

dx/dt = (800-300)/(6-2) = 500/4 = 125

Answer:

55%.

Step-by-step explanation:

1) the final percentage can be calculated if $124 is x% and 80 is 100%. Then

2)   [tex]\frac{80}{100} =\frac{124}{x}; \ = > \ x=\frac{124*5}{4}=155 \%[/tex]

3) the required increase is:

155-100=55%

Let's solve this problem step-by-step:

      1. Let's put this in a fraction format:  

             6834 ÷ 17 = [tex]\frac{6834}{17}[/tex]

      2. Now we know 6834 = 6800 + 34

            ⇒ so:

                   [tex]\frac{6834}{17} =\frac{6800+34}{17} =\frac{6800}{17} +\frac{34}{17}[/tex]

     3. Now let's convert the fractions to denominators

              [tex]\frac{6800}{17} +\frac{34}{17} =[/tex] (6800 ÷ 17) + (34 ÷ 17)    

Let's check:

Answer:  (6800 ÷ 17) + (34 ÷ 17) or Choice (C)

Answer: 5x 5y

Step-by-step explanation: because of the length

53

hope it helps...!!!!

Answer:

1/4

Step-by-step explanation:

Using points (0 ; 1) and (4 ; 2)

m= y2-y1 / x2-x1

= 2-1 /4-0

= 1/4

The gradient of the blue line is, 1/4

The equation of line in point-slope form passing through the points

(x₁ , y₁) and (x₂, y₂) with slope m is defined as;

⇒ y - y₁ = m (x - x₁)

Where, m = (y₂ - y₁) / (x₂ - x₁)

Given that;

Two points on the blue line are (3, -3) and (3, -6).

Now,

Since, The equation of line passes through the points (4, 2) and (8, 3).

So, We need to find the slope of the line.

Hence, Slope of the line is,

m = (y₂ - y₁) / (x₂ - x₁)

m = (3 - 2) / (8 - 4)

m = 1 / 4

m = 1/4

Thus, The gradient of the blue line is, 1/4

Learn more about the equation of line visit:

https://brainly.com/question/18831322

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Answer:

The answer is

→ [tex]4 + 7i[/tex]

Step-by-step explanation:

[tex]((-2) + (3 * i)) * (1 - (2 * i)) = 4+7i[/tex]

Therefore, [tex]4+7i[/tex] is your answer.

Hope this helped! :^)

⭐Brainliest will be appreciated!⭐

✉️Message me if you have any more questions!✉️

- ✨7272033Alt✨

Submitted on 4/22/2022 at 12:39 PM

(To avoid plagarism, by users whom decide to copy.)

See screenshots below to prove my point that [tex]4+7i[/tex] is your answer...

The three positive numbers whose sum is 27 will be 14, 1, and 12.

A number is a mathematical entity that can be used to count, measure, or name things. For example, 1, 2, 56, etc. are the numbers.

Suppose the three positive numbers are x, y and z.

If the summation of numbers is 27.

⇒ x + y + z = 27 --- (1)

⇒ z = 27 - x - y

Suppose the square sum of the number be S.

∴ S = x² + y² + z²

⇒ S = x²+ y² + (27 - x - y)² --- (2)

We will optimize the function, partially differentiating it with respect to x and y, and setting dS/dx = 0 to get the minimum value of S.

2x + 2(27- x - y)(-1) = 0

2x - 54 + 2x + 2y = 0

4x + 2y - 54 = 0

y = 27 - 2x --- (3)

Differentiate partially with respect to y as

2y + 2(27 - x - y)(-1) = 0

2y - 54 + 2x + 2y = 0

4y + 2x - 54 = 0

x = 54 - 2y --- (4)

Substitute the value of y = 27 - 2x in the equation (4),

x = 12 - 2(27 - 2x)

x = 12 - 54 + 4x

4x - x = 54 - 12

3x = 42

⇒ x = 14

By substituting x = 14 in equation (3)

y =2(14) - 27

y = 28 - 27

⇒ y = 1

Substitute the values of x and y in equation (1),

14 + (1) + z = 27

z = -14+27-1

z= 12

Thus, the three positive numbers whose sum is 27 will be 14, 1, and 12.

Learn more about the number here:

brainly.com/question/17429689

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[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

[tex] \textbf{Volume of a cube can be represented as :} [/tex]

[tex] \textsf{And the side length is given as a} [/tex]

[tex] \textsf{So, volume of the given cube is :} [/tex]

Answer:

area is 254.34 circumference is 56.52

Step-by-step explanation:

To find the area you need to follow the formula r^2(pi)

so it would be 9x9x3.14 which is 254.34

to find circumference you need to find diameter which is double the radius (9x2) so the diameter is 18

To find circumference to need to do radius x pi

18x3.14 is 56.52

Answer:

Step-by-step explanation:

f(x)= -(-2)^2 + 3 = -4 + 3 = -1

Answer:

[tex]\sec^2(\alpha)=1+\tan^2(\alpha)[/tex]

[tex]\csc^2(\alpha)=1+\cot^2(\alpha)[/tex]

[tex]\cot^2(\alpha)=\dfrac{1}{\tan^2(\alpha)}[/tex]

[tex]\begin{aligned}\sec^2(\alpha) \cdot \csc^2(\alpha) & = (1+\tan^2(\alpha))(1+\cot^2(\alpha))\\\\ & =1+\cot^2(\alpha)+\tan^2(\alpha)+tan^2(\alpha)\cot^2(\alpha)\\\\ & = 1+\cot^2(\alpha)+\tan^2(\alpha)+\tan^2(\alpha) \cdot \dfrac{1}{\tan^2(\alpha)}\\\\ & = 1+\cot^2(\alpha)+\tan^2(\alpha)+ \dfrac{\tan^2(\alpha)}{\tan^2(\alpha)}\\\\& = 1+\cot^2(\alpha)+\tan^2(\alpha)+1\\\\& = \tan^2(\alpha)+\cot^2(\alpha)+2\end{aligned}[/tex]

Answer:

See below ~

Step-by-step explanation:

Trigonometric Identies (needed)

Solving

Expanding the LHS

∴ Hence, we have proved the left hand side of the equation is equal to the right hand side.

The area of the composite figure = area of square + area of triangle + area of rectangle = 58.5 ft²

Area of the composite figure = area of square + area of triangle + area of rectangle = s² + 1/2(bh) + lw

Given the following:

Area of the composite figure = (3²) + 1/2(11)(3) + (11)(3)

Area of the composite figure = 58.5 ft²

Learn more about the area of a composite figure on:

https://brainly.com/question/8408690

Answer:

hi. this is the way

Step-by-step explanation:

this is the process of doing it. hope you like it

Answer:

hey can you help me to do homework

Answer:

the square root of 120

Step-by-step explanation:

a^2+b^2=c^2

a^2+7^2=13^2

a^2+49=169

a^2=120

a= the square root of 120