If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when x is 11

expression: y = 3.6x

for x = 11, then y = 39.6

Step-by-step explanation:

Direct variation uses the following equation:

y = kx

For each case, there will be an actual number instead of k.

We need to find which value of k our problem uses. We can use teh given x and y values, and solve for k.

y = kx, use x = 5 and y = 18, and solve for k

18 = k * 5

k = 18/5 = 3.6

In our case, k = 3.6, so the specific equation for direct varuiation for this problem is

y = 3.6x

Now we can find y when x = 11.

y = 3.6x

y = 3.6(11)

y = 39.6

20

step-by-step explanation:

d 25 pi/6

step-by-step explanation:

the diameter is 10 inches

the radius is 1/2 of the diameter or 5 inches

the area of the circle is

a = pi r^2

  = pi 5^2

  = 25 pi

the slice is 60 degrees of the entire circle.

60 degrees out of 360   60/360 = 1/6

the area of the slice is 1/6 of the circle

a slice = 1/6 a circle

a slice = 1/6 * 25 pi