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melomori [17]
3 years ago
10

5+3r=5r-19? what is the answer need help!

Mathematics
2 answers:
qaws [65]3 years ago
5 0
The answer to <em>5 + 3r = 5r - 19 </em>is <em>r = 12</em>.
Alexxandr [17]3 years ago
5 0
The answer is r = 12
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SAT prep: Prove that 3x – 4 ( 5 – x ) is equivalent to 7x – 20
Alik [6]
3x -4 (5 - x) = 7x -20
3x-20+4x=7x-20
7x-20=7x-20
4 0
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.

6 0
3 years ago
3x into 4x minus 5 plus 3 if x is equal to 1/2
Solnce55 [7]

Answer: 8 3/4

Step-by-step explanation:

3x(4x-5+3); where x is 1/2

Substitute the value 1/2 with x

3 1/2 (4 1/2 - 5+3)

7/2 (9/2 -2)

7/2 (5/2)

35/4 = 8 3/4

8 0
3 years ago
Due tomorrow please help
NeX [460]
For some of these, a calculator is helpul.

The sum is 294903.

_____
This is the sum of 15 terms of a geometric sequence with first term 9 and common ratio 2. That sum is given by the formula
S_{n}=a\dfrac{r^{n}-1}{r-1}
S_{15}=9\dfrac{2^{15}-1}{2-1}=9\cdot(32768-1)=294903

7 0
3 years ago
(√3-√2) (√3+√2) simplify this question​
cestrela7 [59]

Answer:

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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