What are acute and obtuse angles

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.