My dad's old baseball card increased in value from $400 to $500. what was the percent increase?

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x