Simplify the expression given below. 1 + 2 13 + 2x2 90 32 + 1 22 9 1 18 | OA. 3x + 1 1 OB. (r + 3)( - 3) ) O C. OD. 3r + 1 31 + 1 (r + 3) (1 - 3)

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels

Simplify the expression below -3(10x+4y)+6(6x-2y)

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.