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Zinaida [17]
4 years ago
13

I need help, could someone help me solve this? Also please explain so I can do other ones on my own. Thanks in advance!​

Mathematics
1 answer:
defon4 years ago
3 0

Answer:

x = 9

Step-by-step explanation:

Solving for x the equation

First with add 6 in each term in the equation in order to solve for x

6+3x+(-6) = 21+6

3x = 27

Then we divide both term for 3

3x/3=27/3

resulting

x = 27/3

Reducing

x = 9

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18 questions answered correctly on a test. that is 75% of the total number of questions. How many questions were on the test?
adelina 88 [10]

Answer:

24 = questions on test

Step-by-step explanation:

Questions answered correctly = questions on test * percent answered correctly


We know that she answered 18 correctly and that 75% were answered correctly

Substitute this information into the equation

18 = questions on test *.75

Divide by .75 on each side

18/.75 = questions on test *.75/.75

24 = questions on test

7 0
3 years ago
How many square metre of carpeting are needed to cover a floor that measures 8m by 5m​
grigory [225]

Answer:

40 meters squared

Step-by-step explanation:

8 * 5 = 40

5 0
3 years ago
Use the Distributive Property to multiply. 2(b – 7)
mr Goodwill [35]

Answer:

2b - 14

Step-by-step explanation:

2(b – 7)

2b - 14

8 0
3 years ago
Read 2 more answers
A table of values of a linear function is shown below.
ikadub [295]

Given:

A table of values of a linear function.

To find:

The slope, y-intercept and equation of the function.

Solution:

Take any two points on the table.

Let the points are (-1, -3) and (0, -6).

Slope of the line:

$m=\frac{y_2-y_1}{x_2-x_1}

$m=\frac{-6-(-3)}{0-(-1)}

$m=\frac{-6+3}{0+1}

$m=\frac{-3}{1}

m = -3

Slope of the function = -3

y-intercept of the function is the point where x = 0.

In the table y = -6 when x = 0

y-intercept = -6

Equation of a line:

y = mx + c

where m is the slope and c is the y-intercept

y = -3x + (-6)

y = -3x - 6

Equation of a function is y = -3x - 6.

3 0
3 years ago
What is the sum of X2-3x+7 and 3x2+5X-9
Pie
x^2-3x+7+3x^2+5x-9=\ \ \ \  | combine\ like\ terms\\\\
4x^2+2x-2\\\\
Solution\ is\ 4x^2+2x-2.
6 0
3 years ago
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