How can you solve problems involving equations that contain addition, subtraction, multiplication, or divison

Ana earns 2.5% simple interest on $2,000 in her savings account. she does not make any deposits or withdrawals. after 3 years, how much interest will ana have earned on her savings account?

Harry the hook has 7 1/3 pounds of cookie dough.she uses 3/5 of it to bake cookie. how much cookie dough does she use to make cookie?

X² + 4y² = 36 the major axis runs along: a) y=4x b) x-axis c) y-axis