zodiacpumpkin1126
01.03.2021 •
Mathematics
The sum of all the ages of Dylan and Renee is 57 years . 9 yrs ago , Dylans age was 2 times Renee's age. How old is Dylan now?
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Ответ:
Step-by-step explanation:
let present age of
Dylan=x
Renee=y
x+y=57
9 years ago
x-9=2(y-9)=2y-18
x=2y-18+9=2y-9
so 2y-9+y=57
3y=57+9=66
y=66/3=22
x+22=57
x=57-22=35
Dylan's present age=35 years
Ответ:
39² is equal to 1521
80² is equal to 6400
Now we know 1521 + 6400 = c²
7921 = c²
Square each side, divide and you get c = 89 mm
The hypotenuse is equal to 89 mm