Answer:
5.32
Step-by-step explanation:
a^2+b^2=c^2
a^2+4.7^2=7.1^2
a+22.09=50.41
50.41-22.09=28.32
a=5.32
1. Answer=66cards
Lets use the variable 'x' to represent the number of baseball cards in Keith's collection that he started with. The following equation can be made.
(x+6)/2=36
multiply both sides by 2
x+6=72
subtract 6 from both sides
x=66 cards
2. Answer=$12
Lets use the variable 'a' to represent Sara's allowance. The following equation can be made:
(a/2)+7=13
subtract 7 from both sides
a/2=6
multiply both sides by 2
a=$12
Answer: The answer is 40 minutes
Step-by-step explanation:
He only read 20 minutes last saturday so that means he needs to read 10 extra minutes so he can make up for the minutes he lost. Add 10 to 30 minutes and you get 40 minutes.
