Permutations and combination math 30 question!

How many different combinations of 3 letters can be made using all 26 letters in the alphabet?

a) 15 600

b) 2600

c) 23

d) 69

Which explains why the sequence 81, 3, 1/9 ... is arithmetic or geometric?

If 29 more than 2 times a number is - 15, what is the number? -7 -22 7 22

Log 3x = 4 how do you cancel out the log?

Describe how to multiply a number by a power of 10

Marble (calcium carbonate) reacts with hydrochloric acid solution to form calcium chloride solution, water, and carbon dioxide. What is the percent yield of carbon dioxide if 3.65 g of the gas is collected when 10.0 g of marble reacts?

Keoki's class collected money to donate to charity one Kok yolky counted the money there were $140 five dollar bills and 255 there were one dollar bills what expression could he use to find out how much was collected

A cinema is selling movie tickets for adults and children. If one person buys 3 adult tickets and 10 child tickets and spends $175, and another person buys 6 adult tickets and 7 child tickets and spends $220, how much does each type of movie ticket

A valve in a full 6000 gallon water tank is slowly opening. Water flows out of the tank through the valve. The flow rate in gallons per hour is given by the function f (t) = 300 t^2 where t is in minutes.

A store has apples on sale for $10.00 for 4 pounds. If an apple is approximately 5 ounces, how many apples can you buy for $40.00? Complete the explanation.

0.07 divided by 1.22?