You’ve earned 52%, 78%, 52%, and 64% on our previous for exams in a math class what do you need to earn on the next exam to have an average of 70% among all exams?

The marks that should be earned on the next exam should be 108%.

Given that,

Based on the above information, the calculation is as follows:

Since there is the average of 70%, so the total should be 350%.

Now the earning on the next exam should be

= 350% - 52% - 78% - 52% - 64%

= 104%

Therefore we can conclude that the marks that should be earned on the next exam should be 108%.

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You'd better hope for some bonus points on the last exam, because you need 104%.

Step-by-step explanation:

70% * 5 = 350%

52% + 78% + 52% + 64% + x% = 350%

246% + x%  = 350%

x% = 104%

b. 24 mm

step-by-step explanation:

use the pythagorean theorem.

a^2 + b^2 = c^2

a^2 + 7^2 = 25^2

a^2 + 49 = 625

a^2 = 576

a = 24

answer: b. 24 mm