Commutaive property says
ab=ba or expanded to say
abc=cba
associative peropty =
a(bc)=(ab)c
so using that
first mix them up knowing that we can move the parenthaseese
all possible equivelnt ones are
4*(5*3)
(3*5)*4
3*(5*4)
(3*4)*5
3*(4*5)
À is for sure and b too since they both have more than one variable.
<span>So lets solve #30. </span>Start by solving the mini equations in the brackets and parenthesis. Work left to right. So start by subtracting four from three. you get -1. Do the next parenthesis, four add nine is 13. Now your equation looks like this: 7-2(-1)+5(13)=?. Next do multiplication and division from left to right. So you'd want to multiply -2 to -1. You get two. Next multiply 5 to 13 to get 65. Now your equation looks like this: 7+2+65= 74. Your answer is 74.
Lets x = width
height = 2x - 4
A = 1/2 b h
63 = 1/2 (x)(2x-4)
126 = 2x^2 - 4x
2(x^2 - 2x - 63) = 0
2(x - 9)(x + 7) = 0
x - 9 = 0; x = 9
x + 7 = 0; x = -7
so width = 9
height = 2(9) - 4 = 18 - 4 = 14
answer
width = 9 in
height = 14 in
