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mariarad [96]
3 years ago
13

Evaluating expressions PLEASE Help ⁉️⁉️⁉️⁉️⁉️⁉️⁉️⁉️⁉️

Mathematics
1 answer:
anastassius [24]3 years ago
6 0

Answer:

Step-by-step explanation:

12  .x=3                y= -3

-x+2(y-1)

=-3+2(-3-1) = -3 -6 -2 = -9 -2 = -11

13.a=3

-5(a^2) -a + 5

=-5(3^2) -3 + 5  =  -5(9) +2  = -45 +2 =-43

14.  a = -2             b=4

-4a +3(2b-1)

= -4(-2)  +3( 2(4)-1 ) =8 +3(8-1)  = 8 +3(7) = 8 +21 =29

15. x = -2

3x^2 - 4x +1  =3(-2^2) -4(-2) +1 =  3(4) -4(-2) + 1 = 12 +8 +1 =20 +1 =21

                                 

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Step-by-step explanation:

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3 years ago
I need answers and explanation with ratios to help my daughter with homework
Leviafan [203]

Using proportions, it is found that:

2. Bree types at a faster rate, as her ratio of 1.13 words per second is greater than Alan's rate of 0.83 words per second.

3. Bree also makes mistakes at a raster rate, as her rate of 0.375 mistakes per second is greater than Alan's rate of 0.33 mistakes per second.

<h3>What is a proportion?</h3>

A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct or inverse proportional, can be built to find the desired measures in the problem.

For each of Alan and Bree, we have to find the proportions of words typed per second and mistakes per second.

Then, for Alan:

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  • Mistakes per second: 2/6 = 0.33.

For Bree:

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Then:

2. Bree types at a faster rate, as her ratio of 1.13 words per second is greater than Alan's rate of 0.83 words per second.

3. Bree also makes mistakes at a raster rate, as her rate of 0.375 mistakes per second is greater than Alan's rate of 0.33 mistakes per second.

More can be learned about proportions at brainly.com/question/24372153

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7 0
2 years ago
Divide 28 cans of soda into two groups so the ratio is 3 to 4.
shtirl [24]
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