Solve.The amount of gas that a helicopter uses varies directly as the number of hours spent flying. The helicopter flies for 4 hours and uses 52 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 5 hours.
A. 70 gallons
B. 65 gallons
C. 20 gallons
D. 78 gallons
Answer: B
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A certain radioactive substance decays exponentially with yearly decay factor of 0.96. There are initially 103 grams present. ? A: Write a formula that gives the amount A, in grams, of the substance remaining after t years. ? B: How much is left after 7 years? Round your answer to two decimal places. ? C: Plot the graph of A versus t over the first 20 years. ? D: How long will it take until only 26 grams are left? Round your answer to two decimal places.
What will be an ideal response?
Answer the question about the given function.Given the function f(x) = 
, list the y-intercept, if there is one, of the graph of f.
A. 
B. (0, -6)
C. (0, -2)
D. 
Graph the equation by determining the missing values needed to plot the ordered pairs.x - 2y = -8; (0, ), ( , 0), (3, ), ( , 3)
A. 
B. 
C. 
D. 
Solve the equation by completing the square.x2 + 10x - 19 = 0
A. { ± 2
}
B. {-5 ± 2
}
C. {2
± 5}
D. {-5 ± 2
}