Solve the system of equations by the substitution method

y = 2x+7

y=9x+8

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?