I got 347 as the number because 23% of 347 is almost 80.
(<span>23 *<span>347)/100 = 79.81
23*347= 7981
7981/100 = 79.81
Round that and you get 80.</span></span>
Answer:

Step-by-step explanation:
Given



Required
Find y

So, the expression becomes

Collect like terms


Collect like terms


Make y the subject


Answer: each book costs $13
Step-by-step explanation:
dividing 65 by 5 gets the answer
Answer: 32
Step-by-step explanation:
we have in this case right triangle with a leg equal to 24 and a hypotenuse equal to 40
c^2=a^2+b^2
40^2=24^2+b^2
b^2=1600-576=1024
b=sqrt1024=32