(10 points) when given the m∠1 =(2x - 9) and m∠2 = (5x - 7),find the value of x that will make m || n?

For this one, set bot angles equal to 180 like this:  

2x-9+5x-7=180

The reasoning is a straight line has an angle of 180 and the two angles being in opposite positions, you can set them equal to 180.

Now combine like terms:

2x+5x=7x

-9-7=-16

Now your new problem looks like:

7x-16=180

Next isolate the x:

7x-16+16=180+16

7x=196

Now divide by 7 to make the x by itself:

7x/7=196/7

This comes out even to x=28.

Now since it is a word problem, higher math says to answer it in the same format:

To make m and n congruent, x has to equal 28.

Hope this helps!

well if he bought them at 5 cedis each sold them at 7 cedis each then he would make a profit of 2 cedis of each book. if in total he made 150 cedis profit that means he sold 75 books. he lost 12 books at the start so that means he originally bought a total of 82 books.

step-by-step explanation: