Answer:
139, I am sorry if I'm wrong
Step-by-step explanation:
a1=11; d=19-11=8
a17=11+(17-1)*8=11+128=139
I don’t know about this question
Answer:
Amount in 4% account: $550
Step-by-step explanation:
Use simple interest formula
where
I = interest
P = principal
r = rate (as decimal)
t = time.
<u>4% account:</u>

then

<u>5% account:</u>

then

You have earned $69.50 in total, so

Amount in 4% account: $550
Amount in 5% account: $950
The equation that we can create from this situation is:
i = (190 – 5 x) * (29 + x)
where i is the income and x is the increase in daily rate
Expanding the equation:
i = 5510 + 190x – 145x - 5x^2
i = -5x^2 + 45x + 5510
Taking the 1st derivative:
di/dx = -10x +45
Set to zero to get the maxima:
-10x + 45 = 0
x = 4.5
So the cars should be rented at:
29 + x = 33.5 dollars per day
The maximum income is:
i = (190 – 5*4.5) * (33.5)
i = 5,611.25 dollars