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2 years ago

Help plz my teacher didn't explain how i'm supposed to solve these

Mathematics

1 answer:

Gnesinka [82]2 years ago

5 0

Answer: See below for each answer. I did it step by step.

Step-by-step explanation:

90=(x+18)+x 90-18=x+x 90-18=2x 72=2x x=36

90=(x-52)+x 90+52=2x 142=2x x=71

180=(x-10)+(x-20)+x 180+10+20=3x. 190+20=3x 210=3x x=70

90=(x+36)+x 90-36=2x 54=2x x=26

90=(x+10)+(x+10) 90-10-10=2x 80-10=2x 70=2x x=35

180=(x+20)+x 180-20=2x 160=2x x=80

180=(x-14)+x 180+14=2x 194=2x x=97

180=(x+20)+(x+10) 180-20-10=2x 160-10=2x 150=2x x=75

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solmaris [256]

You left out the 9 in the whole equation. The 1st step you had right you just forgot to put +9. 2nd step you are combining the like terms and get 11-26x=-34x+40. Step 3: you are trying to isolate the x on one of the sides. You need to switch the 11 over to the 40 and get 29. Move -34x over to -26x and get 8x. Step 4 all you are doing in dividing 8 from both sides and get 5.

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3 years ago

Which phrase describes the algebraic expression 6x?

Allisa [31]

The algebraic expression uses the terms to denote symbols

sum of means addition

difference of means subtraction

product of means multiplication

quotient of means division

Here we have the term 6x

which actually means 6 times x or

6 multiplied by x

hence by multiplication we use the word product of

so we have the product of 6 and a number as our right answer

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3 years ago

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What do the following two equations represent?

noname [10]

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It parallel line.

Step-by-step explanation:

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2 years ago

PLEASEE HELPP Match the correct graph to the story below.

Tanya [424]

Answer:

Step-by-step explanation:

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3 years ago

Suppose that you are an elementary school teacher and you are evaluating the reading levels of your students. You find an indivi

aleksklad [387]

Answer:

The child's reading level is at the 3.4th percentile.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

You do some research and determine that the reading rates for their grade level are normally distributed with a mean of 90 words per minute and a standard deviation of 24 words per minute.

This means that $\mu = 90, \sigma = 24$

You find an individual that reads 46.4 word per minute. At what percentile is the child's reading level?

The percentile is the p-value of Z when X = 46.4, multiplied by 100. So

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{46.4 - 90}{24}$

$Z = -1.82$

$Z = -1.82$ has a p-value of 0.034.

0.034*100 = 3.4

The child's reading level is at the 3.4th percentile.

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2 years ago