They give us the length of side of the square which is 3-7x.
To get an expression for the perimeter that is expressed as a product we have to multiply the expression 3-7x by four since every square has four sides. This will give us an expression of 4(3-7x). We than can use the distributive property to multiply everything inside the parenthesis by 4. This will give us an expression of 12-28x.
Answer: 21
1) simplify 6+4 to 10
10+6+5
2) simplify 10+6 to 16
16+5
3) simplify
21
I’m sorry that’s not my level but i would love to help
B is correct, because there is only 1 output for each input.
You = her*1.1
her = you/1.1 = you*0.9090...
her = you - you*(1 - 0.9090...) = you - you*0.0909...
--> 9.09% younger
x = 9.09
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