7) What number is the opposite of -17?

17

Step-by-step explanation:

the opposite of any negative number is the positive and vice versa

+17

Step-by-step explanation: Here we are asked to determine the opposite of the following integer which is -17.

Think of the opposite of an integer in terms of a number line. The opposite of an integer is the same distance from zero as the original integer, but on the opposite side of zero.

Since -17 is 17 units to the left of zero, it's opposite will be 17 units to the right of zero. So the opposite of -17 is +17.

The problem has two solutions

1. If 9 and 12 are legs, then the hypotenuse (x) is:
    x = √(9²+12²) = √(81+144) = √225 = 15

2. If 9 is the leg, and 12 is the hypotenuse, then the other leg (x) is:
    x = √(12²-9²) = √(144-81) = √63 ≈ 7.94