Which equations support the fact that rational numbers are closed under addition? Select each correct answer.

3√5+√5=4√5

√10 + (-√10) = 0

1/2 + 0.5=1

3√16 + 3√16=6√16

It takes 6 cuhes to build a staircase with 3 steps. How many cubes will be needee for 11 steps

The equation h (t) = - 16t^2+120t+65 gives the height of a firework, in feet, t seconds after it is launched from a platform. What is the height of the platform?

Cliff Branch bought a home with a 10.5% adjustable rate mortgage for 30 years. He paid $9.99 monthly per thousand on his original loan. At the end of 3 years he owes the bank $65,000. Since interest rates have risen to 12.

The sum of three is-44.84

What is 21m-7 factored using the gcf

If the rate of inflation is 3.9% per year, the future price p (t) (in dollars) of a certain item can be modeled by the following exponential function, where t is the number of years from today. p (t) = 400 (1.039^t).

The number of measles cases has increased by 8.3% since 2000. Express your answer rounded correctly to the nearest hundredth. Stated another way, the number of measles cases is times what it was in 2000.

f (x) = |x|+1 transform f by shifting it left 5 units and up 8 units, and write the new function equarion.

What is the percent change from 70 to 56

Which rational number is equivalent to 3.27 repeating? A. 327/990 B. 27/99 C. 47/11 D. 3 27/10 E. 3 27/100