I need help with this

(-3 , 0)

Step-by-step explanation:

The x-intercept is the point on which lies on the x-axis, so when the y is equal to 0.

They y-value can be seen as gaining 16 whole numbers every time the x gains 3.

1. Add intervals of +16 to the y-value (from -32) and intervals of +3 to the x-value (from -9) until the y-value equals 0.

Show:

(-9+3 , -32+16) = (-6 , -16)

(-6+3 , -16+16) = (-3 , 0)

The y-value in the end, is 0 with a x-value of -3.

15.5

step-by-step explanation:

5

∑

n = 1

substitute n = 1, 2, 3, 4, 5 and sum the terms

= + + + 2² + 2³

= 0.5 + 1 + 2 + 4 + 8

= 15.5