Josh can clean the math building on his campus in 2 hours. Ken takes 23 hours to clean the same building. If they work together, how long will it take them to clean this building?

Mark and peter went to an arcade where the machines took tokens. Marilk played 9 games of ping pong and 5 games of pinball, using a total of 29 tokens. At the same time, peter played 3 games of ping pong and 1 game of pinball using up 7 tokens.

A diver is descending to reach the bottom of a lake. After 15 seconds, she is 90 feet below the surface of the water.

Derive the equation of the parabola with a focus at (6, 2) and a directrix of y = 1. f (x) = - 1/2 times (x - 6) ^2 + 3/2 f (x) = 1/2 times (x - 6) ^2 + 3/2 f (x) = - 1/2 times (x + 3/2) ^2 + 6 f (x) = 1/2 times (x + 3/2) ^2 + 6

Solve for x: 6/x + 2/2x = 8/x + 1/3

Abbey gets paid a flat rate of $10.00 to mow her neighbors lawn plus a additional $5 per hour to rakes the leaves.

Travel Ez sells dollars at a rate of ($1.40) / (1 euro) and buys dollars at a rate of ($1.80) / (1 euro). At the beginning of a trip, Sophie exchanged $540 to get 300 euros.

What is the range of y = square root x+7+5?

Is to a solution of the equation 3x+6=6x?

What would - 9 1/2 be as a decimal?

Write the inequality that represents "-5o is warmer that - 8o." (o=temperature)