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ElenaW [278]
3 years ago
9

Which expression is equivalent to 2.8k - 8.4

Mathematics
1 answer:
serg [7]3 years ago
3 0

First by simplifying step by step 

2.8k-8.4

There are no like terms.

Answer is = 2.8k-8.4


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Asa received scores of 72, 97, and 82 on her last three math tests. She needs a mean test score of 82 to qualify for the math te
Flauer [41]

Scores are {72, 97, 82, x} where x is the unknown fourth score

They add up to 72+97+82+x = x+251

Divide this sum over four because there are four scores we want to average out. We end up with (x+251)/4 = M where M is the mean. Asa wants the mean to be 82, so make M = 82.

We can replace M with 82 and solve for x like so

(x+251)/4 = M

(x+251)/4 = 82

x+251 = 4*82

x+251 = 328

x = 328-251

x = 77

Asa needs a score of 77 on the fourth test so that the mean of the four tests is 82. If she scores higher than 77 on the fourth test, then the mean will be larger than 82.

-----------------------------------

Depending on what your teacher is looking for, the first step is to establish your variable. So you would say "let x = fourth score". However, that seems too easy. So perhaps your teacher is looking for the equation (x+251)/4 = 82 or some variant of it.

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Which number sentence illustrates the commutative property of addition?
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What is the equation of a line that passes through points (0, 4) and (-4, -8)?
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Answer:

y = 3x + 4

Step-by-step explanation:

The equation of a line in slope- intercept form is

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