Question

Apples cost $2 per pound, and grapes cost $3 per pound.
write and simplify an expression for the total cost if you buy 10 lbs of apples and grapes combined. (Use only the variable a)

Answer 1

\[2a+3(10-a)\]

Answer 2

apples=$2/pound
grapes=$3/pound


a pounds of apples
g pounds of grapes

Total is 10 pounds, so

g=10-a

cost=a*2+g*3=a*2+(10-a)*3=2a+10+3a=5a+10

Answer 3

oops last line - should be:

cost=a*2+g*3=a*2+(10-a)*3=2a+30-3a=30-a