Which expressions represent the difference of exactly two expressions? Choose 3 answers:
A.6(x + 7) - 2
B.-21
C.4f - 2g
D.3.xyz - 10

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Reduce fractions expressing probability to lowest terms. in 3,000 repetitions of an experiment, a random event occurred in 500 cases. the expected probability of this event is?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?