khaz1430
13.07.2019 •
Mathematics
*i already got the answer just want to make sure im correct * devonte's scores on his first four spanish tests are 92,85,90,and 92. what test score must devonte earn on the fifth test so that the mean will be exactly 90? *i think the answer is 91*
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Ответ:
Note that the fifth test = x
There are 5 tests, and the mean will be 90
" (92 + 85 + 90 + 92 + x)/5 = 90 " is your equation
Simplify
(359 + x)/5 = 90
Isolate the x. Note the equal sign. What you do to one side, you do to the other. Do the opposite of PEMDAS.
(359 + x)/5 (5) = 90(5)
359 + x = 450
Isolate the x. subtract 359 from both sides
x + 359 (-359) = 450 (-359)
x = 450 - 359
x = 91
91
hope this helps
Ответ:
lol
Step-by-step explanation: