The mean life of a tire is 30.000 km. The standard deviation is 2000 km.
Then, 68% of all tires will have a life between
km

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.

The moats separating people from the animals are 5 m wide for lions and 4 m wide for the elephants. if the lion’s moat is 4 m deep, how deep should the elephants’ moat be?