1) The sum of the two numbers is 36 and their difference is 9. Find the average of the two numbers.

22.5 and 13.5 are the numbers. average of both numbers is 18.

Step-by-step explanation:

Given that there are two numbers.

let them be, x and y

using the unknown numbers,

make x the subject:

Solve them simultaneously:

Then another number, x:

Average:

Let the two numbers be x and y

x+y = 36 (1)

x - y = = 9(2)

(1)+(2)

x +y = 36

x - y = 9

2x = 45

x = 45/2

Then y =?

x - y =9

45/2 - y =9

y = 45/2-9

y = (45-18)/2

y = 27/2

The two numbers are 45/2 and 27/2

the answer is b.)

< 1=< 2

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12