The heights of two trees are shown in the illustration below. Find the sum of their heights, if h = a, and H = a + 2.
?
?
A. a
B. 2
C. 2a + 2
D. a + 2
E. 2a + 4
Answer: C
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Using the factoring method, solve for the roots of the quadratic equation.6x2 + 25x + 21 = -4
A. x = 
, x = 
B. x = 
, x = 
C. x = - 
, x = - 
D. x = - 
, x = - 
Find the slope of the line through the pair of points.(-1, -6) and (7, -3)
A. 
B. - 
C. 
D. - 
Evaluate the expression.
A. 10 B. 25 C. 8 D. 15
The concentration of a drug in an organ at any time t (in seconds) is given by 
where 
is measured in grams/cubic centimeter
src="https://sciemce.com/media/3/ppg__cognero__5.2_Logarithmic_Functions__media__129e9bd3-5f7e-4095-814f-e67c7afe71f0.PNG" style="vertical-align:middle;" />. How long would it take for the concentration of the drug in the organ to reach 0.19
?
?
Please round the answer to two decimal places.
?
A. 
sec
B. 
sec
C. 
sec
D. 
sec
E. 
sec