Simplify 2^n - 1 / 4^n - 1

What is 21/35 in its simplest form?

Brian was thinking of a number. Brian doubles it, then adds 13 to get an answer of 76.3. What was the original number?

Ninety-eight percent of all babies survive delivery. However, 15 percent of all births involve Cesarean (C) sections, and when a C section is performed, the baby survives 96 percent of the time.

Determine if the circumference of a circle with the radius of 4 feet will be greater or less than 24 feet

Lorena took a survey of the students in her honors science class to determine how many are going to college. She found that 85% of the students plan to go to college.

Karina is making accessories for the soccer team. She uses 628.86 inches of fabric on headbands for 45 players and 2 coaches. She also uses 384.30 inches of fabric on wristbands for just the players.

Can a ratio of a parents age to his or her child's age ever be exactly 3:2?

Create an example of a linear system that would best be solved using the substitution method. Explain your reasoning.

What is the value of x in 3/5x+9=-3

Jeffs water bill includes a base charge of 12.00. plus a charge of 1.50 for each 1000 gallons of water used. his water bill is 28.50. how many gallons of water did jeff use?