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jungcoochie101
19.09.2019 •
Mathematics
The average of 4 numbers is 98. if 3 of the numbers are 86, 87, and 91, what is the 4th number?
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Ответ:
average=98
if 3 of the numbers are 86, 87 and 91 then what is the fourth number
assign
x=86
y=87
z=unknown
91=t
(86+87+z+91)/4=98
do parenthasees first
(264+z)/4=98
multiply both sides by 4 to get rid of fraciton
264+z=392
subtract 264 from both sides
z=128
the fourth number=128
Ответ:
answer:
adasdadasa
step-by-step explanation: