# Posts by Coach

Total # Posts: 11

**chemistry**

Suppose that 50mL of a solution of sulfuric acid of unknown concentration was titrated with a 0.100M solution of sodium hydroxide. If it took 45.5 mL of titrant to reach the equivalence point, what was the concentration of the unknown solution of sulfuric acid???

**math HELP**

When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the ball hits the ground?

**algebra**

When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the ball hits the ground?

**algebra**

When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the ball hits the ground?

**algebra**

47-9x=119 -9x=72 -9x/-9=119/-9 x=-8

**algebra**

How far can you see to the horizon from a mountain top that has a height of 9000 m? Use the formula V= 3.5 sqrt h

**algebra**

How far can you see to the horizon from a mountain top that has a height of 9000 m? Use the formula V= 3.5 sqrt h

**algebra**

If a car leaves a skid mark of 500 feet, how fast was the car traveling? Using the formula r=2ã5L

**algebra**

Simplify by removing the factor of 1 5y -20 / 5y

**math**

A rectangle measures 30 feet by 20 feet and has a post at each corner. If posts are placed 2 feet apart. How many posts will there be in all?

**physics**

In the photoelectric effect, does brightness or frequency determine the Kinetic energy of the ejected electrons? Which determines the number of the ejected electrons?