7. A small child came across a pile of pebbles while playing in a park. He decided to make a design by lining up the pebbles in rows. The first row
had 7 pebbles. Each row had 4 more pebbles than the previous row. If the
child made 15 rows, what is the total number of pebbles in the design?

y=mx+b

step-by-step explanation:

m slope, b y-intercept

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !

mk./km: lm

step-by-step explanation:

,mlmlm

; mk

lk