Can someone pls explain this to me

30, 90

Step-by-step explanation:

To find the unit rate divide:

50 ÷ 20 = 2.5

The unit rate is 1:2.5, which means for every minute, Jill can answer two and a half math problems. We can use this to find the other proportions.

12 × 2.5 = 30

36 × 2.5 = 90

This means the chart should look like this:

20 : 50

12 : 30

36 : 90

see explanation

Step-by-step explanation:

x² - 4x + 4 + y² + 8y + 16 = -4 + 4 + 16

(x -2)² + (y + 4)² = 16

center = (2, -4)

radius = 4