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See below in bold.

Step-by-step explanation:

2/3:

24/ 3 = 8 so we multiply by 8/8:

2/3 * 8/8

= 2*8 /3*8

= 16/24 Answer.

5/8 : we multiply by 3/3:

5/8 * 3/3

= 15/24 Answer.

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x