Write an expression equivalent to 12+5t−4+15t+1

Which expression is equivalent to 2x^2+7x+4?

What is the range of the data below? .8090100

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period. value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?