Which expression is equivalent to 5a + 4 - 2a - 9?

A company produced 24.1 tons of paper towels in 2015. The company's paper towel production increase by 7.9% from 2015 to 2016, and by 5.2% from 2016 to 2017. Which expression below represents a for estimating the total production of paper towel, in tons, in 2017?

Which expression is equivalent to $d\ +d\ -0.16d$  ?

Which expression is equivalent to $-\frac{1}{4}\left(8x+20\right)-6$ ?

At a store, a cap has a regular price of x dollars. During a sale, the price of the cap is discounted 24%. The expression 0.76x describes the discounted price, in dollars, of the cap. Which expression also describes the discounted price, in dollars, of the cap?

Which expression represents the difference of $\left(3x+8y\right)$ and  $\left(x-y\right)$ ? 

Angelica bought a used laptop for y dollars. One year later the value of the laptop was 0.64y. Which expression is another way to describe the change in the value of the laptop?

Which expression is equivalent to $\left(-5x+6\right)+\left(2x-9\right)$ ? 

Chris drew a rectangle that was $w$ inches wide. He then drew a second proportional rectangle to the first. The expression $3\left(2w\right)+3\left(w\right)$ represents the perimeter of the second rectangle Chris drew. Which statement relates the perimeter of the 2nd rectangle to the perimeter of the first rectangle?