Colin invests £4600 into his bank account. He receives 4% per year compound interest.
How much will Colin have after 7 years?
Give your answer to the nearest penny where appropriate.

please show your working

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Prove that 16^4-2^13-4^5 is divisible by 11.

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.