rivermadds1514
15.03.2020 •
Mathematics
David’s age is 7 years more than three times Bree’s age. If the product of their ages is 110, how old is David?
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Ответ:
Step-by-step explanation:
Bree's age = x
David's age= 3x+7
x*(3x+7)=110
3x² + 7x =110
3x² + 7x - 110 = 0
3x² - 15x +22x - 22*5 = 0
3x*(x - 5) +22 (x - 5) = 0
(x - 5) (3x + 22) = 0
x - 5 = 0 { 3x + 22 = 0 is not considered as age wont come in negative}
x = 5
Bree's age = 5 years
David's age = 3x + 7 = 3*5 + 7 = 15 + 7 = 22 years
Ответ:
True
Step-by-step explanation:
This means that the area of any parallelogram is equal to the product of its base and its height.