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hoa [83]
3 years ago
15

(6x-7)-(4+3x)=13 PLS HELP​

Mathematics
2 answers:
Agata [3.3K]3 years ago
6 0

Step-by-step explanation:

Easy, remove the parenthesis

Since negative on positive is negative, it would be *underlined is changed equation*

6x-7- <u>4-3x</u>=13

combine like terms

6x-3x=3x

3x= <u>13+7+4</u> (Bring all numbers that are not x's to the other side) *changed is underlined* *nubers become positive if on the other side in this situation*

Add: 13+7+4

13+7=20

20+4=24

3x=24

24 divided by 3x

(whole numbers always come first in dividing)

*ignore the x's in 3x*

24 divided by 3(x) is obviously 8

So x would be 8

x=8

Cheers! Mark brainliest if really useful :D

klemol [59]3 years ago
3 0

(6x - 7) - (4 + 3x) = 13

6x - 7 - 4 - 3x = 13

(6x - 3x) + ( - 7 - 4) = 13

3x - 11 = 13

3x = 13 + 11

3x = 24

x =  \frac{24}{3}

x = 8

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The difference between the solutions to the equation X squared = a is 30. what is a. show that your answer is correct.
Snowcat [4.5K]
The difference between the solution to the equation x² = a is 30.
x² = a
x = √a or x = -√a.

The difference between the solutions satisfies the condition
√a - (-√a) = 30
2√a = 30
√a = 15
a = 15² = 225

Check the answer.
When x = +√a,
x² = (√a)² = a   Correct
When x = -√a,
x² = (-√a)² = a  Correct

Answer:  a = 225, and the answer checks out to be correct.

5 0
3 years ago
Best explained and correct answer gets brainliest!
mezya [45]
The answer is B because C and D are not true. Angle-Angle theorem does not prove congruency. Hypotenuse-Leg does because having a hypotenuse means that the triangle is a right angle triangle, which means that 2 sides and an angle are congruent in the triangles. By Side-Side-Angle Theorem, the triangles are congruent.
3 0
3 years ago
a rectangular field is 50 M long and 30 M broad . find a perimeter b) the length of wire required to fence it thrice c)calculate
kow [346]

Answer:  b) 160 c) 1500

Step-by-step explanation: b) 50 + 50 + 30 + 30 = 160 c) 50 x 30 = 1500

8 0
3 years ago
Read 2 more answers
Specifications call for the wall thickness of two-liter polycarbonate bottles to average 4.0 mils. A quality control engineer sa
bija089 [108]

Answer:

The null hypothesis μ=4.0 could not be rejected.

Step-by-step explanation:

In this problem we have to perform a hypothesis test of the mean, with s.d. of the population unknown.

The sample is: [3.999, 4.037, 4.116, 4.063, 3.969, 3.955, 4.091]

This sample has a mean of 4.033 and a standard deviation of 0.061.

The null and alternative hypothesis are:

H_0: \mu = 4.0\\\\H_1: \mu \neq 4.0

We assume a significance level of 0.05.

The test statistic for this test is:

t=\frac{M-\mu}{\sigma}=\frac{4.033-4.0}{0.061}=0.536

We have a sample size n=7, so the degrees of freedom are 7-1=6.

For a two-tailed test, t=0.536 and df=6, the P-value can be look up in a t-table.

The P-value is 0.61. Is greater than the significance level, so the effect is not significant and the null hypothesis can't be rejected.

8 0
4 years ago
Can you help me please
user100 [1]

The answer to this question is 10. The working out is shown in the image attached.

*** Sorry instead of writing 170 I wrote 270 for the big angle.. other than that it's correct

or another way to solve this is....

we know that a straight line is 180 degrees and the angle APD is 170 all we need to do is subtract 170 from 180 to get the answer of DPB

Hope this helped

3 0
3 years ago
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