Alarge truck is going down a hill at 60 miles per hour. the driver needs to begin slowing down by shifting the gears. the speed goes down by 10 miles per hour each time he downshifts. which expression shows his speed after three shifts?
60 + (3 × 10)
60 – (-10 × 3)
60 – 10
60 + (-10 × 3)

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.