The answer is 27. I figured that out by multiplying 9x12 so that I could convert nine feet to inches. That equaled 108. After that, I divided that by 4 to see how much years it would take and it was 27 years.
7.11x10^7 would be 71,100,000 in scientific notation
(4x2 – 4x – 7)(x + 3)
(4x2 – 4x – 7)(x) + (4x2 – 4x – 7)(3)
4x2(x) – 4x(x) – 7(x) + 4x2(3) – 4x(3) – 7(3)
4x3 – 4x2 – 7x + 12x2 – 12x – 21
4x3 – 4x2 + 12x2 – 7x – 12x – 21
4x3 + 8x2 – 19x – 21
Answer: A+C=500
7.5A+4.75C=3351.25
C=500-A
7.5A+4.75(500-A)=3351.25
7.5A+2375-4.75A=3351.25
2.75A=976.25
A=355 adults ($2662.50)
C=500-A=145 children ($688.75)
Step-by-step explanation:
1/8 = 0.125
0.125*3 = 0.375