Please help me solve!- Amy completed a 200-mile bicycle race in 25 hours. After the race, she realized that the air pressure in her tires was low which slowed her down by an average of 4 miles per hour. She wants to solve the equation to find r, her average speed in miles per hour with properly inflated tires.

25(r - 4) = 200

Shania's test scores in 8 subjects were 88, 91, 85, 74, 69, 72, 80, and 87. shania found the middle number of her scores. which type of measure did she find?

41/2 - 1 1/3 what is the answer as a fraction?

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?