X+3y=18 3x+9y=12 determine weather the graphs of each pair of equations are parallel, perpendicular, coinciding, or none of these

What type of study would you conduct if you wanted to know how many miles a week on average students on the school's cross country team run during the summer? Explain your reasoning. * Your answer

Given the following perfect square trinomial, find the missing term: ___x2 + 40x + 100 1 2 4 10

10x-8xy-3xy what is this in simplest form?

18 is 13+5, and 42 is 23+19

State whether each percent of change is the percent of increase or percent of decrease. Then find each percent of change. Round to the nearest whole percent. Original: 50 New: 80

The mean length of 7 books is 258 pages. the longest book has 294 pages. what is the mean length of the other 6 books

A pyramid has n sides what is the expression for the total number of sides

The sum of Sally and Beth's age is 60. Six years ago, Sally was 3 times as old as Beth. What are their present ages?

A circle has a radius of 37 units and is centered at (1.3, - 3,5). What is the equation of the circle?

An arithmetic sequence is defined by the general term tn = - 5 + (n - 1) 78, where n ∈N and n ≥ 1. What is the recursive formula of the sequence?