A moneybox contains only 50c and 20c coins. If there are 74 coins altogether, totalling $22.90, how many of each type of coins we're there?

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Acircle has a circumference of 28.36 units what is the diameter of the circle