Answer:
80 x 30 = 2,400
Step-by-step explanation:
A,b,c,d,e. jxddddssssssssssssssss
The amount of sales (S) of statin in billions of dollars by 2017 is 34.5 billions
<h3>Linear equations</h3>
Linear equation are equation that has a leading degree of 1. Given the equation that represents Statins used to keep cholesterol in check and are a top-selling drug in the U.S.
S-1.5x = 6
where
S is the amount of sales
x is the number of years after 1998
By 2017, the total number of years is 19 years
Substitute
S = 1.5x + 6
S = 1.5(19) + 6
S = 28.5 + 6
S = 34.5
The amount of sales (S) of statin in billions of dollars by 2017 is 34.5 billions
Learn more on linear equation here: brainly.com/question/14323743
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<h3>
Answer: Choice A</h3>
0.10d + 0.05n = 2.25
d = 2n
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Explanation:
n = number of nickels
d = number of dimes
we have twice as many dimes as nickels, so we could have something like 18 dimes and 9 nickels. Algebraically we would write d = 18 and n = 9. The equation that fits this is d = 2n. The answer is between A and B at this point.
We rule out choice B since the 0.05d is incorrect. It should be 0.10d to represent the total value of all the dimes.
Choice A is correct
d = number of dimes
0.10d = value of all the dimes in dollars
n = number of nickels
0.05n = value of all the nickels in dollars
0.10d + 0.05n = total value from both coins combined
2.25 = total value from both coins combined
0.10d + 0.05n = 2.25
Expected Mean, E(X), is obtained by multiplying each pair of

and its

and add up the answers
E(X) = (0×0.7) + (1×0.2) + (2×0.1) = 0.4
The formula to calculate the variance, Var(X), is given by E(X)² - (E(X))²
E(X²) = (0²×0.7) + (1²×0.2) + (2²×0.1) = 0+0.2+0.4 = 0.6
(E(X))² = (0.4)² = 0.16
Var(X) = 0.6 - 0.16 = 0.44
Translating these answers into the context we have
E(Y) = 0.4×500 = $200
Var(Y) = $110