Answer:
x=17
Step-by-step explanation:
The angle seen here is 180 degree so the equation we make to solve for the variable should equal to 180
First let's set up our equation:
7x+2x+27=180
Then we will combine like terms:
9x+27=180
Next we have to get rid of 27 so we only have 9x on one side. To do this let's subtract 27 on both sides of the equation:
9x=153
Now all we have to do is divide both sides by 9 to isolate the variable:
and you get x=17
Answer:
a=0, b=-4
Step-by-step explanation:
a+b=-4.....(1)
a-b=4.......(2)
(1)+(2): 2a=0
a=0
0+b=-4
b=-4
(a, b) =(0,-4)
Answer:
x = 28
Step-by-step explanation:
15 + 3x = 99
-15. -15
<u>3x</u> = <u>84</u>
3. 3
x = 28
There would be 2 children and 9 adults
Explanation: $22x 9 adults= 198
$15x 2 children= 30
Then you add them together and 198+30 = $228
Apply division by 10 when one tenth of a number is required and apply multiplication by 10 when 10 times of a number is required.
<u>Solution:</u>
Need to determine what operation is required to get one-tenth of a number and 10 times of a number
To get one tenth of a number, divide the number by 10.
For example to get one – tenth of 100, divide it by 10, we get 10 as a result.

To get ten times of a number, multiply the number by 10
For example 10 times of 10 = 10 x 10 = 100
Hence apply division by 10 when one tenth of a number is required and apply multiplication by 10 when 10 times of a number is required.