Which of these situations does not have quantities that combine to make 0?

O A. A dolphin swims 20 feet straight down from the surface. It then
rises 20 feet to return to the surface.

B. A hot air balloon rises 40 feet. It then drops 40 feet to the ground.

C. Hiroko earns $20 working concessions at the football game. She
then earns $20 as a babysitter.

D. In the morning, the temperature rises 30 degrees. In the evening, it
falls by 30 degrees.

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

~

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct

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its a, i had the same answer, its from study island right

step-by-step explanation: