You add the percentages and you get 142 percent. To convert a percent to a decimal, you divide by 100, so the answer is 1.42.

Do the expression in the parantheses and you get $\displaystyle 10$. Then you do $\displaystyle 10^{2}$ and you get $\displaystyle 100$. Then you do $\displaystyle 8\div4$ and you get $\displaystyle 2$. Then you add $\displaystyle 3+2-100 = -95$.

You add all three values and you get $\displaystyle \$147.80$.

First, convert $\displaystyle \dpi{100} \frac{1}{4}$ into a decimal. We are left with

$\displaystyle \dpi{100} .24+2.5+.25$

Now add the three numbers, being careful to line the decimal points up exactly.  From right to left we will add:

1) 4 and 5 = 9

2) 5, 2, and 2 = 9

3) 2 is alone = 2

This leaves us with 2.99 for the final answer.

$\displaystyle K$ can be equal to any of the prime numbers between 45 and 55, of which there are two - 47 or 53. 

$\displaystyle L$ can be equal to any of the prime numbers between 15 and 25, of which there are three - 17, 19, and 23.

Their sum can be any of the following:

$\displaystyle 47+ 17= 64$

$\displaystyle 47+ 19= 66$

$\displaystyle 47+ 23= 70$

$\displaystyle 53+ 17= 70$

$\displaystyle 53+ 19= 72$

$\displaystyle 53+ 23= 76$

This makes five possible sums.

To find the greatest possible value of $\displaystyle K + L$, add the greatest possible value of $\displaystyle K$to the greatest possible value of $\displaystyle L$. This happens when $\displaystyle K$ is equal to the greatest prime between 35 and 45, which is 43, and when $\displaystyle L$ is equal to the greatest prime between 85 and 95, which is 89. Add the two numbers:

$\displaystyle 43 + 89 = 132$

Since this reasoning is valid regardless of the actual scores, suppose Quinn scored 100. Then Ned scored 19 more than Quinn, or 119, and Melanie scored 12 more than Ned, or 131. Phyllis scored 45 more than Ned, or 164, and Olivia scored 20 points fewer than Phyllis, or 144. This makes the order, from greatest to least:

Phyllis, Olivia, Melanie, Ned, Quinn

Melanie scored third among the five.

Supplementary angles add up to 180 degrees. Given that $\displaystyle 45+135=180$, the correct answer is 135. 

Use order of operations, so you would first complete the operation in the parentheses, which would give you $\displaystyle -6$.

Then you do exponenets, so $\displaystyle \left ( -6\right)^{2} = 36$.

Then you do division which is $\displaystyle 36\div4 = 9$.

Then you do addition from left to right, so $\displaystyle 7+36 = 43$.

Last, you add $\displaystyle 43$ to $\displaystyle 9$, which is $\displaystyle 52$.

To simplify this expression, regroup and combine like-terms.

$\displaystyle a+2a+3+9a+6= (a+2a+9a)+(3+6)$

$\displaystyle (a+2a+9a)+(3+6)= 12a+9$