Calculate the area of a circle with a radius of 2 cm and a circle with a radius of 4 cm. leave your answers in terms of pi.

when the radius doubles, does the area of the circle double?
a) 4π cm2; 8π cm2; no
b) 4π cm2; 16π cm2; no
c) 4π cm2; 16π cm2; yes
d) 4π cm2; 8π cm2; yes

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?

Which of the following three dimensional figures has a circle as it’s base