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the area of classroom 3 is 175 square feet

Step-by-step explanation:

725 - 220

505

505 - 330

175

Given : The Total Area of 3 Classrooms is 725 sq.ft

Given : The Area of Classroom-1 is 220 sq.ft

Given : The Area of Classroom-2 is 330 sq.ft

Total Area of 3 Classrooms will be : Sum of the given Three Classrooms (i.e) Classroom-1 , Classroom-2 and Classroom-3

⇒ Total Area of 3 Classrooms = Area-1 + Area-2 + Area-3

⇒ 725 = 220 + 330 + Area of Classroom-3

⇒ Area of Classroom-3 + 550 = 725

⇒ Area of Classroom-3 = 725 - 550

⇒ Area of Classroom-3 = 175 sq.ft

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15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)