Sara is practicing her diving. Her height above the water, in meters, t seconds after she jumps off the diving board is given by the equation h (t) = -5t²+ 10t + 15. How many seconds does it take Sara to reach the water?

6.3x+14 and 1.5x-6 answer in simplified form

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

What is the absolute value of the complex number -4-sqrt2i