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tester [92]
3 years ago
13

Please answer this! Brainliest will be given. :)

Mathematics
1 answer:
butalik [34]3 years ago
5 0

Answer:

D

Step-by-step explanation:

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Which could be the first step in solving this system of equations by substitution?
Ainat [17]

Answer:

The first step is to replace the y in y-x=15 with 7x (we can do this because the first equation tells us that they're equal)

solve and get

(2.5,17.5)

or x= 2.5 y=17.5

Step-by-step explanation:

The first step is to recognize that y=7x which means that we can just replace the y in the second equation with 7x

7x-x=15

6x=15

x=2.5

Then we can solve for y

y=7(2.5)

y=17.5

3 0
3 years ago
What is the volume of a square<br> pyramid with the base length of<br> 24in and a height of 18in?
gtnhenbr [62]

Answer:

V=3456

Step-by-step explanation:

V=a^{2}\frac{h}{3\\}

6 0
3 years ago
A square frame has an area of 100 square feet. What is the length of one side of the<br> frame
taurus [48]

Answer:

so one side right?

Step-by-step explanation:

3 0
3 years ago
Find the average rate of change of the function over the given interval.
Minchanka [31]

Answer:

Average rate of change = 20.2

Rate of change at the left endpoint :   f' (5) = 4t = 20

Rate of change at the right  endpoint : f' (5.1) = 4*5.1 = 20.4

Step-by-step explanation:

The average rate of change of the function

F(t) = 2t^2 - 1 ,  [ 5,5.1 ]

solution

\frac{f(5.1)-f(5)}{5.1 - 5} = \frac{2*(5.1)^2-1-(2*5^2-1)}{0.1}   = [ 2 ( 26.01 - 25 ) / 0.1 ]

= 2.02 / 0.1 = 20.2

Rate of change at the left endpoint :   f' (5) = 4t = 20

Rate of change at the right  endpoint : f' (5.1) = 4*5.1 = 20.4

6 0
3 years ago
Sally walked 3/4 of a mile before lunch and 1/2 of a mile after lunch. How far did she walk in all?
Wittaler [7]

Answer:

1 1/4

Step-by-step explanation:

5 0
2 years ago
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