85+45=3(28+15) is this right or wrong

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Which of the following is true about the graph of f(x)=7^x. select all that apply. a= it intercepts the x axis b=it intercepts both axis c=it intercepts neither d=it intercepts the y axis

What is the answer to question 11? will give extra points! include a explanation (reasonable) for you : )