What number subtracts/adds to 15 but multiplies to -50?

Given a circle with a radius of 2 which is the length of an arc measuring 75

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?

Which of the following circles have their centers on the x-axis? check all that apply.