H + c = 2.25
h − c = 1.75

What value of h makes the system of equations true?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625