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mario62 [17]
3 years ago
11

15x + 45 = 15 (3 + x) always never one solution how do I do it​

Mathematics
2 answers:
const2013 [10]3 years ago
8 0

Answer:

0

Step-by-step explanation:

First, you need to try to get rid of the ().

To do this:

15 * 3 and 15 * x

This makes 45 and 15x after the = , so the formula is now:

15x + 45 = 45 + 15x

Now get the 15x to the left side. When a number switches sides, it becomes negative when positive and positive when negative. So in this case 15x will become -15x and the 45(on the left) becomes - 45

15x - 15x = 45 - 45

Answer: 0

Aleonysh [2.5K]3 years ago
8 0
15x + 45 = 45 + 15x
15x - 15x = 45 - 45
0x = 0 (*)
If we plug any real numbers of x to equation (*) we will always get 0 = 0
So the set of solutions of this question is all real numbers
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Sophie [7]

Answer:

D)  x² -x - 10  =0

Step-by-step explanation:

Given that

             \frac{2}{3x-6} - \frac{1}{3x+6} = \frac{1}{3}

L.C.M

         \frac{2(3x+6)-(3x-6)}{(3x+6)(3x-6)} = \frac{1}{3}

        \frac{(6x+12-3x+6)}{(3x+6)(3x-6)} = \frac{1}{3}

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8 0
2 years ago
Scores on the SAT are approximately normally distributed. One year, the average score on the Math SAT was 500 and the standard d
Nookie1986 [14]

Answer:

The score of a person who did better than 85% of all the test-takers was of 624.44.

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.

One year, the average score on the Math SAT was 500 and the standard deviation was 120.

This means that \mu = 500, \sigma = 120

What was the score of a person who did better than 85% of all the test-takers?

The 85th percentile, which is X when Z has a p-value of 0.85, so X when Z = 1.037.

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

1.037 = \frac{X - 500}{120}

X - 500 = 1.037*120

X = 624.44

The score of a person who did better than 85% of all the test-takers was of 624.44.

8 0
2 years ago
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