Chip picked a number. He multiplied the number by 7 and then decreased it by 33. Fiona took the same number and found that 15 less than 10 times the number results in the same value. Problem

Which could be the number that Chip chose?

A 3

B -6

C -3

D 6

For what values of b will f(x)= logbx be a decreasing function? (16 )

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|