I believe it's 15, but correct me if I'm wrong
This is because there is one 10 in 15. This gives you 3 tens and 5 in the ones.
Answer:
The expression is true.
Explanation:

We know that (a +b)(a-b) = a²-b²
So we have ,

Which is Right Hand Side given.
So, the expression is true.
Answer:
Step-by-step explanation:
Answer:
no
Step-by-step explanation:
The ratios of the two shortest sides are different:
3/2 ≠ 5/4
so the quadrilaterals cannot be similar.
Answer: 2
-7 - (-9) could be visualized as -7 + 9
-7 + 9 is 2