900 let me know if it works!
Answer:
the scores on her last test is x (x > 0)
because on her last tests she scored 4 points lower than she did on her fifth test
=> the scores in the 5th test is x + 4
because Angela’s average for six math tests is 87, we have:
=> on her last test, she had 85
=> on her 5th test, she had 85 + 4 = 89
5(2z + 4) = 0
10z + 20 = 0
10z = -20
z = -20/10
z = -2
Hi!
To solve this problem you can set up a proportion (I like doing it this way) or you can just do:
First deal:
(24/3)*5 = 40 dollars
Second deal:
(24/4)*6 = 36 dollars
Finding money saved:
40-36 =4
They will save 4 dollars buying the second 4 for 6 dollars deal!
You have to add 12+8+9 which equals 29 then subtract 29 from 36 and get 7 so your answer is
7 cm