I need help on this I will give brainlist help it will mean a lot this is my last math problem help me!

If 1/2+2/5s=s-3/4,what is the value of s? a. s=3/4 b. s=25/12 c. s=-25/12 d. s=-3/4

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25