What adds to be -5 and multiplies to 6.25

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?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

For each sentence below, find the value of x that makes each sentence true. (515) 5 = 25* x= (813)2 = 4* x=