You have 42 coins valued at $3.00/ Some of the coins are dimes and some are quarters. which system of equations could you use to determine the number of dimes and the number of quarters you have?

A) 0.10d+0.25q=42 and d+q=3
B) d+q=42 and 0.10d+0.25q=3
C) d+q=42 and d+q=3
D) d+q=42 and 0.25d+ 0.10q=3

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41