Atextbook store sold a combined total of 423 math and psychology textbooks in a week. the number of math textbooks sold was 45 more than the number of psychology textbooks sold. how many textbooks of each type were sold?

+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

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step-by-step explanation: