What is the hydronium ion concentration of a substance that has a pH of 8.45

What's the exact value of sin 150 degrees and cos 150 degrees?

148 is 32% of what number?

9 subtracted from one half of a number is 4

6x2/5 greater than or less than

The ratio of boys to girls in homeroom are 2:3. If there are 8 boys how many girls are there

F (x) = x^2+4 solve using the quadratic formula

Round 28.33 the the nearest hundredth

Built in 1599, the Globe Theatre was home to William Shakespeare and his performing company, The Lord Chamberlain's Men. It was a circular amphitheater that stood 3-stories tall and had a diameter of 100 feet.

If 3 is added to a number and the sum is tripled , the result is 21 more than the number. find the number.

The lengths of the base of a trapezoid is 12ft and 5ft the height is 96 in what is the area of the trapezoid