What's the standard form of eight three million, twenty three thousand, seven

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 i need !

Im literally having a mental breakdown