Cody was 165 cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year how tall was cody on the first day of school last year?

Solution:

Let X = height of Cody on the first day of school last year

Given: Y= height of Cody on the first day of school year = 165 cm

10%(X)+X=Y

.10(X)+X=165

1.10X=165

X=165/1.1

X= 150 cm = height of Cody on the first day of school last year

150

Step-by-step explanation:

i did the khan academy and the correct answer was 150 cm ;-;

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

step-by-step explanation: