A bag of marbles contain 7 blue marbles and 13 red marbles. What percent of the marbles are red? A. 19%
B. 35%
C. 54%
D. 65%
(PLS EXPLAIN ANSWER)

What does x = in this equation x+3+2x=x+5

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.

Abby is collecting rainfall data. she finds that one value of the data set is a high-value outlier. which statement must be true? abby will use a different formula for calculating the standard deviation. the outlier will increase the standard deviation of the data set. the spread of the graph of the data will not change. abby will not use the mean when calculating the standard deviation.