narnar5664
29.07.2020 •
Mathematics
Which expression is equal to 5(2x^2-1)+3(7x^2+1)
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Ответ:
31x² - 2
Step-by-step explanation:
5(2x²-1)+3(7x²+1) = 5*2x² - 5*1 + 3*7x² + 3 = 10x² - 5 + 21x² + 3 = 31x² - 2
Ответ:
a. first box: 75%
second box: 21
b. 7 (u have already wrote)
c. 21+7=28