Why aren't convenience samples representative of the population?
a) the people who are hard to reach will not be represented.
b) the people who are hard to reach are probably the same as the people that are easy to reach.
c) the people who are hard to reach will be the only ones that are represented.
d) the people who are easy to reach will not be represented.

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Find the difference (8ab+a+2) - (3ab+6)

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label