I need help on HOW to do these math problems...I am completely stump. Please show me how I can solve them. Thank you.
1.A car costs $15,150 and decreases in value by 7% per year. How much will the car be worth after 8 years?
A.$15,094
B.$26,030.52
C.$8,477.66
D.$7,884.23
2.In February, you have a balance of $270 in your bank account. Each month you deposit $45. Let January = 1, February = 2, and so on. Write an equation for this situation. Use the equation to find the balance in June.
A.y – 270 = 45(x – 2) ; $450
B.y = 45(x – 4); $270
C.y = 45(x – 4); $180
D.y – 270 = 45x; $45
3.How many real roots exist if the discriminate of the equation =0?
A.0
B.1
C.2
D.4
4. Evaluate (5.0 x 10^3) x (4.0 x 10^7)
(Do I add or subtract the exponents? I'm confused)
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