How do I find the operation to do in math word problems

bryce had a dinner bill of $45 (before the tip). he left a $8.10 tip. what percentage of the tip did bryce leave for the server?

My grandson came home with math homework. No instructions on how to do. Question: What is the difference between 10-5=5

What is 1/4 (9y-3) + 1/8 (6y+9) simplified?

12 1/4 divided by 7/8 Answer

Veronica bought a purse for 25 off its full price. what was the full price of the purse if Veronica paid $35.85 before sales tax? A) $59.75 B) $47.80 C) $ 60.85 D) $36.10

When Rosa tripped and fell into a muddy puddle at lunch (she was so embarrassed!), she knew exactly what would happen: within ten minutes, the two girls who saw her fall would each tell four people what they had seen.

What is the Vertex y=2x^2+6

What is 128 divided by 8

A collector's hockey card is purchased in 1990 for $5. The value increases by 6% every year.

At a local University 54.3% of incoming first-year students have computers. If 3 students are selected at random, find the following probability. A) At least one has a computer B) None have computers