18 answer all questions and show your work - 1.) solve: 40 1/10 x 2.5 2.) solve: 5-3 |3 x (-6)| 3.) solve: f(x)= 3√x-1-1 4.) solve 8 + x^3 5.) solve: f(x)=2x^2+8x+3 6.) solve: x^2+4x+20=0 - : )

step-by-step explanation:

mean or average is 40.6

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7

step-by-step explanation:

for volume, add base x height x width

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.