HOW MANY GALLONS OF A 90% ANTIFREEZE SOLUTION MUST BE MIXED WITH 90 GALLONS Of 10% ANTIFREEZE TO GET A MIXTURE THAT IS 80% ANTIFREEZE

Answer:

x = -5

Step-by-step explanation:

If one draws a perfect verticle line at x = -5, one will have exactly 1/2 the parabola on each side. Then is one where to fold the parabola on that line, then there would be no overhang. Hence x = -5 is the axis of symmetry.

The required answers for the given questions is question are 1) x = -4,  2)  x = 6 - √15,   3) x = 3 + 3√3,   4) x = -3,  and  5)x = -9 - √21  / 5

The quadratic Equation formula is x = -b ± √(b² - 4ac) / 2a

1. x² + 7x + 12 = 0

By using the above formula

Here a = 1, b = 7, c = 12

x = -7 ± √(7² - 4*1*12) / 2*1

x = -7 ± √(49 - 48) / 2

x = -7 ± √1 / 2

x = -7 ±1 /2

x = -7+1 /2           x = -7 - 1 / 2

x = - 6 / 2            x = -8 / 2

x = -3                   x = -4

2) x²-12x+21=0

By using the above formula

Here a = 1,  b = -12, c = 21

x = -(-12) ± √((-12)² - 4*1*21) / 2*1

x = 12 ± √(144 - 84) / 2

x = 12 ± √60 / 2

x = 12 ±2√15  /2

x = 12 + 2√15 /2           x = 12 - 2√15  / 2

x = 6 + √15          x = 6 - √15

3. 18+6y-y²=0

By using the above formula

Here a = -1, b = 6, c = 18

x = -6 ± √((6² - 4*(-1)*18) / 2*(-1)

x = -6 ± √(36 + 72) / -2

x = -6 ± √108 / -2

x = -6 ± 6√3 / -2

x = -6+6√3 /-2           x = -6 - 6√3 / -2

x = 3-3√3            x = 3 + 3√3

4. 3x²+14×+15=0

By using the above formula

Here a = 3, b = 14, c = 15

x = -14 ± √((14² - 4*(3)*15) / 2*(3)

x = -14 ± √(196 - 180) / 6

x = -14 ± √16 / 6

x = -14 ± 4 / 6

x = -14 + 4 /6           x = -14 - 4  / 6

x = -10 / 6                x = -18 / 6

x = -5/3                   x = -3

5.5x²-18x+12=0 ​

By using the above formula

Here a = 5, b = -18, c = 12

x = -18 ± √((18² - 4*(5)*12) / 2*(5)

x = -18 ± √(324 - 240) / 10

x = -18 ± √84 / 10

x = -18 ± 2√21 / 10

x = -18 + 2√21 /10           x = -18 - 2√21  / 10

x = -9 + √21 / 5                x = -9 - √21  / 5

Hence, the values of the given question are 1) x = -4,  2)  x = 6 - √15,   3) x = 3 + 3√3,   4) x = -3,  and  5)x = -9 - √21  / 5

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Answer:

We kindly invite you to see the result in the image attached below.

The number in polar form is [tex]z = 3\sqrt{5}\cdot e^{i\cdot 0.352\pi}[/tex].

Step-by-step explanation:

A complex number is represented by elements of the form [tex]a + i\,b[/tex], for all [tex]a[/tex], [tex]b[/tex] [tex]\in \mathbb{R}[/tex]. The first part of the sum is the real component of the complex number, whereas the second part of the sum is the imaginary component of the complex number. The real component is located on the horizontal axis and the imaginary component on the vertical axis.

Now we proceed to present the point on the graph: ([tex]a = 6[/tex], [tex]b = 3[/tex])  We kindly invite you to see the result in the image attached below.

The polar form of the complex number is defined by:

[tex]z = r\cdot e^{i\cdot \theta}[/tex] (1)

Where:

[tex]r[/tex] - Magnitude of the complex number, dimensionless.

[tex]\theta[/tex] - Direction of the complex number, measured in radians.

The magnitude and the direction of the complex number are defined by the following formulas:

Magnitude

[tex]r =\sqrt{a^{2}+b^{2}}[/tex] (2)

Direction

[tex]\theta = \tan^{-1} \frac{b}{a}[/tex] (3)

If we know that [tex]a = 6[/tex] and [tex]b = 3[/tex], then the polar form of the number is:

[tex]r =\sqrt{6^{2}+3^{2}}[/tex]

[tex]r = 3\sqrt{5}[/tex]

[tex]\theta = \tan^{-1} \frac{6}{3}[/tex]

[tex]\theta \approx 0.352\pi \, rad[/tex]

[tex]z = 3\sqrt{5}\cdot e^{i\cdot 0.352\pi}[/tex]

The number in polar form is [tex]z = 3\sqrt{5}\cdot e^{i\cdot 0.352\pi}[/tex].

Answer:

0.25(7x-6y)

Step-by-step explanation:

Answer:

b

Step-by-step explanation:

n

Answer:

-4

Step-by-step explanation:

Answer:

the answer is -4. it's the same as dividing by a positive, except the number will be negative now :)

Answer:

$43.74

Step-by-step explanation:

will pay= $45

10% of =$45×10/100=$4.5

so, $45-$4.5= $40.5

8% tax= $40.5×8/100 =$3.24

total= $43.74

Answer:

x=17. I think.....

Step-by-step explanation:

Answer:

x = 17

Step-by-step explanation:

Since the two angles are vertical to each other they have the same measure.

x + 35 = 3x + 1 (subtract 1 on both sides)

x + 34 = 3x (subtract x on both sides)

34 = 2x (divide by 2 on both sides)

17 = x

Hope this helps ya!!

Answer:

The answer is B, sorry if I'm wrong.

Step-by-step explanation:

Answer:B=17.3 in2

Step-by-step explanation:

Answer:

71 degrees

Step-by-step explanation:

Use tangent to find x.

tantheta = opposite/adjacent

tan(x) = 130/45

x = tan^-1 (130/45)

x = 70.9

Round to nearest degree = 71 degrees

Answer:

I think it is 90 and 100

Step-by-step explanation:

I used this equation: x is the speed of the slower train

910 = (5x + 10) + 5x

Answer:

The answer is 86 and 96 mph

Step-by-step explanation:

Givens

Train A

Distance traveled = d

time taken = 5 hours

rate traveled = r

Train B

Distance traveled = 910 - d

time taken = 5 hours

rate = r + 10

Formula

basically d = r * t

Solution

Train A: d/r = 5 or d = 5*r

Train B = (910 - d)/(r + 10) = 5    or

Substitute d = 5*r   into Train B

(910 - 5*r)/(r + 10) = 5        Multiply both sides by r + 10

(910 - 5r) = 5 * (r + 10)       Remove the brackets on both sides

910 - 5r = 5r + 50             Add 5r to both sides

910 = 5r + 5r + 50

910 = 10r + 50                  Subtract 50 from both sides

910 - 50 = 10r                  Combine the left

860 = 10r

10r = 860                         Divide by 10

r = 860/10

r = 86

r + 10 = 96

Check

Train A distance: 5*r = 5 * 86 = 430

Train B distance: 5*r = 5 * 96 = 480

Total =                                         910

Answer:

∠EFA

Step-by-step explanation:

The diagram shows several rays starting at point F. There are 2 sets of rays that are opposite to each other ie their angles add up to 180°

These are
FD and FA
FB and FE

You can ignore the other two rays since they do not have any opposite rays and therefore do not figure in a linear relationship

Ignoring FG and FC we get the equivalent of two lines crossing each other at point F

We can eliminate any angles that contain C and G
So we can eliminate ∠BFC, ∠CFG and ∠GFD

Which leaves the last choice as the only option

So answer is ∠EFA

∠EFA is linearly paired with ∠BFD since they lie on the same straight line and the measure of sum of their angles is 180°

∠EFA also is vertically paired with ∠BFD since these angles are opposite each other

Answer:

1 and 3/5

Step-by-step explanation:

Answer:

360 tablespoons.

The length and midpoint of segment PQ, where the coordinate of P is (8, -15), and Q is (13, -10) are;

The given points are;

P(8, -15) and Q(13, -10),

Part A:

The distance between the points P and Q, which may be expressed as d(P, Q), is found as follows;

d(P, Q) = √((13-8)²+(-10-(-15))²) = √(50) = 5•√2

The length of PQ is therefore;

Second part;

The midpoint of segment PQ is obtained from the midpoint formula as follows;

[tex](x_m, y_m) = \left(\frac{x_1 + x_2}{2}, (\frac{y_1 + y_2}{2} \right)[/tex]

The midpoint, [tex](x_m, y_m) [/tex] of PQ is therefore;

[tex](x_m, y_m) = \left(\frac{8+13}{2}, \frac{(-15) + (-10)}{2} \right) = \left(11.5, -12.5\right) [/tex]

The coordinates of the midpoint of segment PQ is (11.5, -12.5)

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Answer:

The numbers are:

{-1, 0, 1, 2, 3}

Step-by-step explanation:

Note: I am assuming "between" does not include the endpoints.

Given the statement

'Four times a number, increased by one, is between negative seven and seventeen'

Let us break down the word statement into small pieces and then combine them to write it into an algebraic expression.

Let x be the number.

4 times a number = 4x

Increase by 1 = 4x+1

between negative seven and seventeen ⇒   -7 < 4x+1  < 17

Thus, the combined statement can be written in an algebraic expression.

-7 < 4x+1  < 17

solving the inequality expression

[tex]-7 < 4x+1 < 17[/tex]

Add -1 to all parts

[tex]-7+-1<4x+1+-1<17+-1[/tex]

[tex]-8<4x<16[/tex]

Divide all parts by 4

[tex]\frac{-8}{4}<\frac{4x}{4}<\frac{16}{4}[/tex]

[tex]-2<x<4[/tex]

Thus, the numbers are:

{-1, 0, 1, 2, 3}

i.e

[tex]-7<4x+1<17\quad :\quad \begin{bmatrix}\mathrm{Solution:}\:&\:-2<x<4\:\\ \:\mathrm{Interval\:Notation:}&\:\left(-2,\:4\right)\end{bmatrix}[/tex]

The graph is also attached below.

Answer:

Step 1     z(c) = 2,323

CI = (  25 ;  30,2 )

Step-by-step explanation:

Normal Distribution:

Sample size  n = 25

Sample mean   μ  = 27,6

Sample standard deviation  s = 5,69

CI = 98 %   then  α  = 1 - 0,98     α = 0,02    α/2  = 0,01

From z-table we don´t  find z (score) for 0,01   directly, we need to interpolate between z = 2,32   and z = 2,33

For   0,0099           z score   is    2,33

for    0,0102            z score   is    2,32

Δ      0,0003                                  0,01

Then   by rule of three

for Δ        0,0003                ⇒      0,01

for Δ   (0,01- 0,0102)          ⇒        x

0,0003    0,01

0,0002      x

x = 0,0067

then  z (score for 0,01)   =  2,33 - 0,0067     z(c) = 2,3233

round to three decimal places z(c) = 2,323

Step 2:

CI =   μ  ±  z(c) * s/√n    ⇒   27,6  ± (2,323 * 5,69)/5

CI =  27,6 ± 2,6436

round to one decimal place

CI = 27,6 ± 2,6

CI = (  25 ;  30,2 )

Answer:

2.5198421

Step-by-step explanation:

Answer:

a = 10 and b = 6

Step-by-step explanation:

I am having a little trouble reading the numbers, but I think that I see

[tex]\frac{7^{2} 7^{8} }{7^{4} }[/tex]

If we wrote this in expanded form, it would look like:

[tex]\frac{7x7x7x7x7x7x7x7x7x7}{7x7x7x7}[/tex]  How many 7s are on the top?  10  That is the answer to a.  The product of powers principle tells us that if we are multiplying powers with the same bases we add the exponents 2 + 8 = 10

[tex]\frac{^{10} }{7^{4} }[/tex]

Now it looks like

[tex]\frac{7x7x7x7x7x7x7x7x7x7}{7x7x7x7}[/tex]  if we cross the 7's out in the top and the bottom, we are left with 6 7's on the top.  That is the answer to b.

The quotient of powers principle tells us that if we are dividing powers with the same bases, we can subtract the exponents (10 -4 = 6)

Answer:

x = 20/3 or x = -12/5

Step-by-step explanation:

Solve for x over the real numbers:

2 abs(x - 1) = x/2 + 8

Divide both sides by 2:

abs(x - 1) = 1/2 (x/2 + 8)

Split the equation into two possible cases:

x - 1 = 1/2 (x/2 + 8) or x - 1 = 1/2 (-x/2 - 8)

Expand out terms of the right-hand side:

x - 1 = x/4 + 4 or x - 1 = 1/2 (-x/2 - 8)

Subtract x/4 - 1 from both sides:

(3 x)/4 = 5 or x - 1 = 1/2 (-x/2 - 8)

Multiply both sides by 4/3:

x = 20/3 or x - 1 = 1/2 (-x/2 - 8)

Expand out terms of the right-hand side:

x = 20/3 or x - 1 = -x/4 - 4

Add x/4 + 1 to both sides:

x = 20/3 or (5 x)/4 = -3

Multiply both sides by 4/5:

Answer: x = 20/3 or x = -12/5

around 44 or above

88+85+84+84+44= 385

385/5= 77

Answer:

$12.00

Step-by-step explanation:

Divide 504.00 by 42 hours

504/42 = 12

He earned $12 per hour

Answer: D=[185]^1/2 or 13.6

(I think but idk... sorry if not correct)

Step-by-step explanation:

D=[(12-8)^2+(4-17)^2]^1/2

D=[(4)^2+(-13)^2]^1/2

D=[16+169]^1/2

D=[185]^1/2

Answer:

Step-by-step explanation:

[tex]d=\sqrt{(4-17)^2+(4-8)^2} =\sqrt{169+16} =\sqrt{185}[/tex]

The speed of plane in still air will be 550 miles / hour and speed of wind will be 50 miles / hour.

It is given that a plane traveled 3900 miles in 6.5 hours with wind and 3250 miles in 6.5 hours against wind.

We have to find out the speed of plane in still air and speed of wind.

What is algebra ?

Algebra is the branch that deals with various symbols and the arithmetic operations such as addition , division , etc.

As per the question ;

Distance travelled with wind in 6.5 hours = 3900 miles

Distance travelled against wind in 6.5 hours = 3250 miles

Let's assume speed of plane in still air be P and speed of wind be W.

So;

The total rate with the wind is the plane speed plus the wind speed and against the wind is speed of plane minus speed of wind.

i.e.,

d = rt

⇒ 6.5 ( P + W ) = 3900 miles  --- ---- --- --- -- ------- ----- --- Equation 1

and

⇒ 6.5 ( P - W ) = 3250 miles  --- ---- --- --- -- ------- ----- --- Equation 2

Let's solve the equations to get value of P and W ;

i.e.,

P + W = 3900 / 6.5

or

P + W = 600

and

P - W = 3250 / 6.5

or

P - W = 500

adding both equations ; we get ;

2P = 1100

or

P = 550 miles / hour

And

W = 50 miles / hour

Thus , the speed of plane in still air will be 550 miles / hour and speed of wind will be 50 miles / hour.

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Step-by-step explanation:

Hey there!

See explanation in picture!

Hope it helps...

Answer:

the amount after 5 years using compound continuously is $135.03

Step-by-step explanation:

The computation of the amount after 5 years using compound continuously is as follows

= Principal × e^(rate × time period)

= $110 × e^(4.2% × 5)

= $110 × 1.227525065

= $135.03

Hence, the amount after 5 years using compound continuously is $135.03

We simply applied the above formula so that the correct value could come

And, the same is to be considered  

41 dollarsStep-by-step explanation: