How you could multiple 6*99 in your head?

A number is multiplied by 2 and then the product is added to 9 the result is 49

V=1/3πh^2 (3r-h) solve for r

Simplify: 5m + 12 + 3 (m + 2)

A ball is thrown into the air with an initial upward velocity of 46ft/s. Its height (h) in feet after t seconds is given by the function h=-16t^2+46t+6. After how many seconds will the ball hit the ground? A. 3 B. 4 C. 5 D. 6

Julie is x years old David is 3 years older than Julie Omar is twice as old as David Write an expression for the sum of Julie, David and Omar's ages

Suppose that the concentration of a bacteria sample is 60 comma 000 bacteria per milliliter. If the concentration triples in 4 days, how long will it take for the concentration to reach 102 comma 000 bacteria per milliliter?

Andrew wants to place grouping symbols in the expression 15 + 25 - 18 : 2 so that it has a value of 18.5. Which shows the correct placing of the grouping symbols? A. (15 + 25) - 18 : 2 B. 15 + (25 - 18 : 2) C. 15 + (25 - 18) : 2 D.

The entrance fee for Mountain World theme park is $15. Visitors purchase additional $2.25 tickets for rides, games, and food. The equation y = 2.25x+15 gives the total cost, Y, to visit the park, including purchasing X tickets.

A movie rental company charges $3 per movie, m, and a monthly fee of $20. What is the equation that represents the cost, C, to rent movies from the company for one month

From greatest to least value order 20% of 100, 20% of 500, 5% of 100