7 hours at 60 mph means 7 hours * 60 mph = 420 miles
He will drive 420 miles per day.
To find the number of days, we divide 3000 miles by 420 miles per day.
3000/420 = 7.14
Since the answer is more than 7 days, he needs at least 8 days for his trip.
The probability that Andrew has heart disease is 0.9. Andrew takes a test for the disease that has an accuracy rate of 75%. What is the probability that Andrew has heart disease and the test accurately predicts it?
Answer: The probability that Andrew has heart disease 
Also we know that the accuracy rate of test
or 
The given two events are independent.
Therefore, the probability that Andrew has heart disease and the test accurately predicts it 
Answer:
f(x) = -18
Step-by-step explanation:
f(x) = 3x - 6
f(-4) = 3(-4) - 6
f(-4) = -12 -6
= -18
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The function
exists in a parabola.
The axis of symmetry of a parabola exists at the midpoint between the two real roots.
The roots exist the solutions of H(t) = 0
To estimate the roots equation exists 
Factor t(-16t + 64) = 0
t = 0 and -16t + 64 =0
-16t + 64 = 0
t = 64 / 16 = 4
t = 4
Then the two roots are t = 0 and t = 4, and the axis of symmetry exists
t = (0+4)/2 = 4/2 = 2
<h3>How to estimate the axis of symmetry?</h3>
The axis of symmetry exists at t = 2.
It represents the time at which the ball is at the higher point, the maximum height.
You can find the maximum height replacing t = 2 in the function H(t)

= 64 feet.
And you can also deduce that the second part of the flight will take 2 seconds, for a total flight time of 4 seconds.
To learn more axis of symmetry refers to:
brainly.com/question/21191648
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