evazquez
17.03.2020 •
Mathematics
25 is 45% of what number
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Ответ:
55.56
Step-by-step explanation:
Let the unknown number be k
(45 x k) / 100 = 25
45k/100 = 25
multiply both sides by 100
45k = 25 x 100
45k = 2500
divide both sides by 45
k = 2500/45
k = 55.56
Ответ:
x²+10x+25=x², 10x=-25, x=-2.5.
CHECK: g(-2.5)=2.5; h(2.5)=6.25=(-2.5)²