What is 5 + 5 x 3 . i add first or multiply

What is the y intercept of f(x)=(1/2)^x?

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?