It's kinda hard to see the top 2 so I wont answer them only because I can't see it clear enough and I don't want to give the wrong answer because i thought it said something else but i can help with #10, anyway here's what I got it might not be fully right because I'm learning this same thing, but I'm pretty good with it.
#10. Since a triangle has a total measure of 180 degrees, you have to figure out how to get each angle to equal 180 when all 3 are added together, so here's how you solve it:
Step 1- Figure out what X represents in this question. Let's start with angle W. They already give you part of the equation, which is W= x +6. So now the next angle is X which the equation is X= 5x-12. The 3rd angle is Y= 7x-48.
Step 2- Add/ subtract the equation for each angle, and write what you got for your answer after each equation.
Step 3- After you have done step 2, try to mess around with each angle (multiply,subtract, etc.) until you got the angles to where they equal to 180 when added together.
Step 4- Write down the value of X in the blank that helped you solve the question. Do the same thing for the 3 angles.
I'm not giving the answer, but do the steps and you will be able to get it. It also helps you so you can do these on ur own.
I don't know if these are the steps u were taught, but this is how my math teacher taught me and the class.
Hope this helps, tell me if it got u the right answer or not!! :-)