Given a = 3, b = 4 , and c = -5 , evaluate the following expressions : 3a(2b - 3c ) A . 528
B . 1947
C . -63
D . 207

Abus ride for a senior citizen cost $1.25. a monthly pass costs $35. write and inequality that represents the number of times a senior citizen must ride the bus for the monthly pass to be a better deal.

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great