1. The ratio of the perimeters of two similar triangles is 3 : 5. The scale factor is 3:5 and the ratio of their areas is 9:25. need work shown

How are algebraic expressions evaluated using substitution?

The cost varies directly with the number of tickets purchased. it costs $145 for 10 people to attend a concert. a. what is the constant of proportionality (k)? b. write the direct variation equation. c. home much does it cost for 8 people? d. graph this situation. be sure to label each axis and give the graph a title.

How to square the standard deviation? how do you get the bottom number so you can actually square it? for instance, 22/6 squared is 1.91, where did they get the 6 from?