It can help because 9×4 =36, and 9×8=72. if you divide 72 by 2 you get 36 which is the answer to 9 ×4. basically because nine is the same in both problems you are multiplying by 4 (and you know 4 is half of 8) you can assume that multiplying the sum of 4 and 9 that you will get the sum of 8 and 9.
Answer:
See below;
Step-by-step explanation:
21 . Consider an exponential function;

<em>Solution; Provided Directly Above</em>
Answer:
11
it's is an icoceles triangle because base angles are equal i.e. 45°
Answer:
6 1/2
Step-by-step explanation:
4x - 8 = 5
4x = 13
13/4 = 6 1/2
x = 6 1/2