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volocibel
31.01.2020 •
Mathematics
Lisa and joey are each saving money for their prom. lisa’s total amount of money is represented by the function f(x)=20-13x. the total amount of money joey has is given by the function g(x)=x^2-10. after how many weeks, x, will they have the same amount of money saved? show your work.
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Ответ:
2 weeks
Step-by-step explanation:
Given in the question that,
Equation that represent Lisa's total amount of money
f(x) = 20 - 13x
Equation that represent Joey's total amount of money
g(x) = x² - 10
To find weeks, x, after which they will have same amount of money, we will equate both equation
20 - 13x = x² - 10x² - 10 - 20 + 13x = 0
x² - 30 + 13x = 0
x² + 13x - 30 = 0
(x - 2)(x + 15) = 0
x = 2 or x = -15
Weeks, x, can not be negative so we will reject x = -15
Hence, after 2nd week Lisa and Joey will have the same amount of money save.
Ответ:
150
Step-by-step explanation:
If u get it wrong sorry :(