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2 years ago

Help a girl out pls

Mathematics

1 answer:

Marta_Voda [28]2 years ago

3 0

Answer:

1 ± sqrt(17)

x = ---------------------------

Step-by-step explanation:

x^2 - x - 4 =0

Using the quadratic equation

-b ± sqrt(b^2 -4ac)

x = ---------------------------

Where ax^2 +bx +c

We know a =1 b = -1 c = -4

-(-1) ± sqrt((-1)^2 -4(1)(-4))

x = ---------------------------

2(1)

1 ± sqrt(1 +16)

x = ---------------------------

1 ± sqrt(17)

x = ---------------------------

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Joe is trying to soup up his dragster. He knows that the time needed for the car to go from 0 to 100 miles per hour varies inver

inysia [295]

8 seconds

The hardest part of this is setting up the equation -- the calculations are pretty easy.

You're told that the time (needed to go from 0 to 100 MPH) is inversely proportional to the horsepower: what this means is that as horsepower gets larger, time gets smaller. This makes sense since the more horsepower you have, the less time it will take you to get to 100 MPH

You can think of this as:

200 HP = 10 seconds
250 HP = x seconds

You set the equation up as:

250 HP / 200 HP = 10 sec / x sec

Now, just cross multiply and solve:

250 / 200 = 10 / x
250x = (200 x 10)
250x = 2000
x = 2000 / 250
x = 8

So, as you increase the horsepower from 200 to 250, the time decreases from 10 seconds to 8 seconds.

Hope this helps!

Good luck.

3 0

3 years ago

If y varies directly with x and y = 87 when x = 3, find y when x = 5. Write and solve a direct variation equation to find the an

Amanda [17]

Answer:

145

Step-by-step explanation:

y=kx

87=3k

k= 87/3

k= 29

y=29×5

y= 145

5 0

2 years ago

HELP HELP HELP HELP HELP HELP

Anton [14]

hi hi hi fnjdjejw was your birthday and i’m is the time for you i’m i yw

6 0

3 years ago

Min knows that Pi times r = 9.42 centimeters. What would she need to do to find the area?

Alinara [238K]

Answer:

The area of the circle is 28.26.

Step-by-step explanation:

πr =9.42

Using that, we can find the radius, which will help us find the area of the circle.

9.42/π = 3 (I used 3.14 for π)

The formula for area of a circle is:

πr^2

Plug our values in.

π(3^2)

9π

28.26

The area of the circle is 28.26.

To sum, Min would need to first figure out the radius of the circle, and then use the radius to find the area of the circle. She can figure out the radius by dividing 9.42 by π, and find the area with the formula πr^2.

5 0

3 years ago

Read 2 more answers

Fareed wants to add 1/4 +5/8 Add the fractions by using the giant one to create a common denominator

saul85 [17]

Hi!

This question is about math.

$\frac{1}{4}+\frac{5}{8}$