A because it will always be 99
Answer:

Step-by-step explanation:
First we need to set up an equation in order to find the value of x. We know that the sum of these angles are 180°

Now we can plug in our value for x into each of the angle's equations

Answer:
x= 4.3125
Step-by-step explanation:
2^2 = 16x - 65
4= 16x- 65
+65 +65
69 = 16x
69/16 =16x/16
4.3125 = x
Answer:
Step-by-step explanation:
Given that,
(-10x - 7) - (3x - 10)
Note:
-×-=+
+×+=+
+×-=-
-×+=-
Then,
(-10x - 7) - (3x - 10)
Open bracket
-10x-7-3x+10
Collect like terms
-10x-3x-7+10
-13x+3
Then, the answer is -13x+3.
D. Always do multiplication first. 2×3 is 6, and 6+4 is 10.