5(3x)-7y2=?,when x=3 and y =2
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Ответ:
17
Explanation:
We are given the equation:
and asked to solve when x=3 and y=2. Therefore, we must plug 3 in for x and 2 in for y.
Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Addition and Subtraction.
Solve the exponent first.
⇒ (2)²= 2*2=4
Multiply 3 and 3.
⇒3*3=9
Multiply 5 and 9.
⇒5*9=45
Multiply 7 and 4.
⇒ 7*4=28
Subtract 28 from 45.
5(3x)-7y² when evaluated for x=3 and y=2 is 17
Ответ:
The side length was multiplied by 5.
Step-by-step explanation:
Area of square =
We are given that the area of square is
So,
So, the side of original square is A.
Area of square =
Area of enlarged square =
So,
So, the side of enlarged square is 5A.
So, the side of the enlarged square is 5 times the side of the original square.
Thus Option B is true .
The side length was multiplied by 5.