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evablogger [386]
3 years ago
13

Need help i am desperate

Mathematics
1 answer:
Mashutka [201]3 years ago
4 0

Answer:

g(x)=-3 f(x)\\or, \: g(x)=\boxed{-3}f(x)

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Joe, working alone, takes 8 hours to mow a lawn. Sally, working alone, can mow the same lawn in 6 hours. How long does it take t
tamaranim1 [39]

Answer: 3 3/7 hours

Step-by-step explanation:

you need to find out how much work they can do in an hour.

let x represent the total collaborative work

1/8 + 1/6 = 1/x

3/24 + 4/24 = 1/x

7x = 24

x = 24/7 or 3 3/7 hours (in decimal form this is 3.4286)

I cannot guarantee this is correct but hope it helped

6 0
3 years ago
For the function f(x) = 8x7, find f-¹(x).
Zanzabum

Answer:

f^-1(x)= \sqrt[7]{x} /8

Step-by-step explanation:

f(x)=8x^7

x^7=f(x)/8

x=\sqrt[7]{x} /8

f^-1(x)= \sqrt[7]{x} /8

6 0
2 years ago
Read 2 more answers
A football is kicked toward an end zone with an initial vertical velocity of 30 ft/s. The function h(t) = -16+ 30t models the he
Ulleksa [173]

Answer:

A. The football does not reach a height of 15ft

Step-by-step explanation:

Given

h(t) = -16t^2 + 30t

Required

Determine which of the options is true

The option illustrates the height reached by the ball.

To solve this, we make use of maximum of a function

For a function f(x)

Such that:

f(x) = ax^2 + bx + c:

f(\frac{-b}{2a}) = maximum/minimum

i.e we first solve for \frac{-b}{2a}

Then substitute \frac{-b}{2a} for x in f(x) = ax^2 + bx + c

In our case:

First we need to solve \frac{-b}{2a}

Then substitute \frac{-b}{2a} for t in h(t) = -16t^2 + 30t

By comparison:

b = 30

c = -16

\frac{-b}{2a} = \frac{-30}{2 * -16}

\frac{-b}{2a} = \frac{-30}{-32}

\frac{-b}{2a} = \frac{30}{32}

\frac{-b}{2a} = \frac{15}{16}

Substitute \frac{15}{16} for t in h(t) = -16t^2 + 30t

h(\frac{15}{16}) = -16(\frac{15}{16})^2 + 30(\frac{15}{16})

h(\frac{15}{16}) = -16(\frac{225}{256}) + \frac{450}{16}

h(\frac{15}{16}) = -(\frac{225}{16}) + \frac{450}{16}

h(\frac{15}{16}) = \frac{-225 + 450}{16}

h(\frac{15}{16}) = \frac{225}{16}

h(\frac{15}{16}) = 14.0625

This implies that the maximum height reached is 14.0625ft.

So, the option that answers the question is A because 14.0625 < 15

8 0
3 years ago
Given the system of equations, what is the solution?<br><br> x + 2y = 7<br> x - 2y = -1
Reika [66]
Add the 2 equations to eliminate the 2y. We get

2x = 6

x = 3

Plug x = 3 into the first equation:-

3 + 2y = 7
2y = 7 - 3 = 4

y = 2


Answer is x = 3 and y = 2
4 0
3 years ago
Colin pays £721.45 a year on his car insurance.
Burka [1]

Answer:

655.08

Step-by-step explanation:

<h3>721.45 ×0.092=66.3734</h3><h3>721.45-66.3734=655.0766</h3>
4 0
3 years ago
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