Work out the surface area of this sphere 7 =radiusgive Ure answer to one decimal place

Step-by-step explanation:

surface area=4πr²=4 ×π×7²=196 π units²≈615.8 units²

2x + 9 = 21

Step-by-step explanation:

Looking at option C;

2x + 9 = 21

Step 1: Subtract 9 from both sides

2x+9 - 9 = 21 - 9

2x = 12

Step 2: divide both sides by 2

2x/2 = 12/2

x = 6

Hence the expression which is a two-step equation is 2x + 9 = 21 since we arrived at the solution in two steps