All categories

3 years ago

Three times the difference of a number and 7 is 30. Find the number.

Mathematics

1 answer:

oksano4ka [1.4K]3 years ago

8 0

Answer:

Step-by-step explanation:

3(x - 7) = 30 is our equation, since we take 7 away from the number and then multiply the result by 3.

3x - 21 = 30

Add 21

3x = 51

Divide by 3

x = 17

To check.

3(17 - 7(

3(10)

30 = 30 Correct

You might be interested in

Increase 80 in the ratio of 3:2

Karolina [17]

Answer:

Ratios describe proportions. We can always multiply across ratios, or divide across them (as long as we do it to all of them). For example, the ratio 3 : 2 is the same as 6 : 4 and 300 : 200. Accuracy Tip.

Step-by-step explanation:

6 0

3 years ago

The basement is 28ft wide and 35ft long. How wide and long is the drawing?

Rudik [331]

Answer:

91.04497992m²

Step-by-step explanation:

hope this helps

7 0

3 years ago

Write a compound inequality to represent all of the numbers between -4 and 6.

blondinia [14]

-4 < 6
Negative number always less than positive number

4 0

4 years ago

What is the difference between 7/10-44/100

katrin2010 [14]

Answer:

7/10-44/100 70-44

100

=26/100

=13/50

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

PLEASE HELP ASAP!!! I NEED CORRECT ANSWERS ONLY PLEASE!!!

aleksley [76]

The length of PR is 4.4 units.

Explanation:

It is given that the length of the hypotenuse is 10 units.

Also, the angle of R is 64°

To find the length of PR, we shall use the cosine formula,

$\cos \theta=\frac{a d j}{h y p}$

Here, $\theta=64$ , adj = PR and hyp = 10

Substituting these values in the formula, we get,

$\cos 64=\frac{P R}{10}$

Multiplying both sides by 10, we get,

$10*\cos 64={P R}$

Substituting the value for cos 64, we get,

$10*0.438={P R}$

Multiplying, we have,

$4.38=PR$

Rounding off, we get,

$PR=4.4$

Thus, the length of PR is 4.4 units.

8 0

3 years ago