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30.08.2021 •
Mathematics
At the movies jodie buys three regular popcorns and five small drinks for her friends at a cost of $24.50 her friend renee buyd four regular popcorns and three small drinks for her friends at a cost of $23.50 find the individual costs of a regular popcorn and a small drink The final answer should be a regular popcorn is $4 and a small drink is $2.50 but I have no idea how to get that answer. Can someone please explain?
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Ответ:
Step-by-step explanation:
24.50 her friend renee buyd four regular popcorns and three small drinks for her friends at a cost of $23.50 find the individual costs of a regular popcorn and a small drink
The final answer should be a regular popcorn is $4 and a small drink is $2.50 but I have no idea how to get that answer. Can someone please explain?
Ответ:
(a) x = 9, (9,4)
(b) x = 1, (1,3)
(c) x = 1 and the graph of f(x) and g(x) intersects at point (1,3)
(d) or x = 9
(e)
Step-by-step explanation:
We are given that ....... (1),and
........ (2)
Now,
(a) We have to solve f(x) = 4
⇒
Converting logarithm to exponent form, we get,
⇒ x = 9 (Answer)
Now, the point on the graph of f(x) will be (9,4) (Answer)
(b) We have to solve g(x) = 3
⇒
Converting logarithm to exponent form, we get,
⇒ x = 1 (Answer)
Now, the point on the graph of g(x) will be (1,3) (Answer)
(c) We have to solve f(x) = g(x)
⇒
Now comparing both sides we can write
x + 7 = 3x + 5
⇒ 2x = 2
⇒ x = 1 (Answer)
Now, at x = 1,
So, the graph of f(x) and g(x) intersects at point (1,3) (Answer)
(d) We have to solve (f + g)(x) = 9
⇒
⇒
⇒
⇒ 3x² + 26x - 477 = 0
⇒ (3x + 53)(3x - 27) = 0
Hence, or x = 9 (Answer)
(e) We have to solve (f - g)(x) = 3
⇒
⇒
⇒
⇒ x + 7 = 24x + 40
⇒ 23x = - 33
⇒ (Answer)