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Otrada [13]
3 years ago
10

Find −3(2.5−k)+0.5(7+8k)

Mathematics
2 answers:
Elis [28]3 years ago
8 0
First, distribute the parentheses:
(-3 * 2.5) + (-3 * -k) + (.5 * 7) + (.5 * 8k)
-7.5 + 3k + 3.5 + 4k

Combine like terms:
(-7.5 + 3.5) + (3k + 4k)
-4 + 7k

I don't see an equal sign so it's not an equation, just an algebraic expression, which means that the answer is -4 + 7k
Svet_ta [14]3 years ago
7 0
<span>The solution to the problem is: x = (-2, -3)</span>
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Sharon uses 6.3 pints of blue paint and white paint to paint her bedroom walls. 4 5 of this amount is blue paint, and the rest i
Y_Kistochka [10]

Given:

Sharon uses 6.3 pints of blue paint and white paint to paint her bedroom walls.

\dfrac{4}{5}th of this amount is blue paint and the rest is white paint.

To find:

The pints of white paint did she use to paint her bedroom walls.

Solution:

We have,

Total paint used = 6.3 pints

Blue paint = \dfrac{4}{5}th of total paint used

                 = \dfrac{4}{5}\times 6.3

                 = 5.04

White paint = Total paint used - Blue paint

                   = 6.3-5.04

                   = 1.26

Therefore, Sharon uses 1.26 pints of white paint to paint her bedroom walls.

5 0
3 years ago
Graph the line that has a slope of 8 and includes the point (0,2).
Marrrta [24]
Graph the point (0,2). From there go up 8 points and right 1 point. Again, from the point (0,2) go down 8 points and left 1 point. Hope this helps!
4 0
3 years ago
One person can do a certain job in 15 minutes and another person can do the same job in 30 minutes. How many minutes will it tak
Flauer [41]

Hello! Your answer is B, 10 minutes.

Say the x = minutes taken to do the job. You can set up an equation like this to solve this.

\frac{1}{15} x + \frac{1}{30} x = 1

This is representative of the situation. The fractions each represent <u>how much each person does in a minute</u>, and when they're multiplied by x, that's <u>how much of the project they get done</u> based off of the minutes they work together on the job. Add the two together, and you get <u>how much of the project is finished in x amount of time</u>. Set it equal to 1, as you are looking for 100% completion.

Once you have this equation, find a common denominator, add, and solve.

\frac{1}{15} x + \frac{1}{30} x = 1

\frac{2}{30} x + \frac{1}{30} x = 1

\frac{3}{30}x = 1

\frac{1}{10}x = 1

x = 10

Therefore, it will take them 10 minutes to do the job together.

Hope this helps!

8 0
4 years ago
A bag contains 56 marbles: 7 red, 8 green, 1l yellow, 17 brown, and 13 blue.
Thepotemich [5.8K]

Answer:

oh i've done this. 8/56 so .14 percent i think

Step-by-step explanation:

3 0
3 years ago
Which of the following expressions are equivalent to (x + y) - z
andrey2020 [161]

C: None of the above

7 0
4 years ago
Read 2 more answers
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