Answer:
4a²+62a+49
Step-by-step explanation:
since (a+b)^2= a^2+2ab+b^2
(3a +7)² – 5a(a-4)
simplify the equation first
9a²+42a+49-5a²+20a
= 4a²+62a+49
Answer:
x= 1, 2
Step-by-step explanation:
The quadratic formula is . Here a=1, b=-3, and c=2.
Substitute and you'll have:
Answer: 3 hours
Step-by-step explanation: Subtract the flat fee first. 15-3=12. She earned $12 without the flat fee, so divide that by 4. $12/$4 per hour = 3 hours.
Answer:
8 mph
Step-by-step explanation:
45 minutes = 6 miles
1 hour = 8 miles