Find y when x=9 if y varies directly as the square of x, and y=100 when x=5

1 answer:

7 0

If y=100 when x=5, then

xz=y (or x times z=y)
so now we know that there is a z, too!

for this problem:

we know that:

x=9
y=? answer: if x=9, then y=180
z=20

20
x 9
___
180

$orry if I confused you!

You might be interested in

The triangle below is equilateral. Find the length of side 2 in simplest radical form

Masteriza [31]

Answer:

$x=\frac{4\sqrt{3}}{3}$

Step-by-step explanation:

From the figure attached,

ΔABC is an equilateral triangle.

Therefore, by the property of the equilateral triangle,

Measure of each angle = 60°

By applying tangent rule in the right triangle ADC,

$\text{tan}(60^{\circ})=\frac{\text{Opposite side}}{\text{Adjacent side}}$

$\sqrt{3}=\frac{4}{x}$

$x=\frac{4}{\sqrt{3}}$

$x=\frac{4}{\sqrt{3}}\times \frac{\sqrt{3}}{\sqrt{3} }$

$x=\frac{4\sqrt{3}}{3}$

5 0

3 years ago

Which expressions are differences of squares?

Lina20 [59]

Difference of 2 perfec squares is
(a^2)-(b^2)

if the exponents are both even and the coeficient (the number in front) are perfect squares, then it is difference t 2 perfect squares

first one
8 is not perfect square

2nd one
(4e^4)^2-(9g^2)^2

third
25 is odd, so it cannot be split up into 2 nice numbers

4th
(11m^9)^2-(3n^5)^2

8 0

3 years ago

Write an inequality to represent the phrase: The sum of a number an 6 is no less than 31

Leviafan [203]

The inequality that represents this phrase is n+6 > 31.

5 0

3 years ago

You earn $102 for doing 12 hours of yard work. Your friend earns $120 working at a store for 15 hours.

krek1111 [17]

Answer:

You earn more per hour and you would get $127.50

Step-by-step explanation: