When money is spent on goods and services, those that receive the money also spend some of it. The people receiving some of the twice-spent money will spend some of that, and so on. Economists call this chain reaction the multiplier effect. In a hypothetical isolated community, the local government begins the process by spending D dollars. Suppose that each recipient of spent money spends 100c% and saves 100s% of the money that he or she receives. The values c and s are called the marginal propensity to consume and the marginal propensity to save and, of course, c+s=1. The number k = 1/s is called the multiplier. What is the multiplier if the marginal propensity to consume is 90%?
Select the correct answer.
a. 4
b. 3
c. 6
d. 7
e. 10
e. 10
Mathematics
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Write a chain rule formula for the following derivative.
for w = f(p, q, r); p = g(t), q = h(t), r = k(t)
A. 
= 
+ 
+ 
B. 
= 
+ 
+ 
C. 
= 
+ 
+ 
D. 
= 
+ 
+ 
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Multiply or divide.(-20) ÷ (-4)
A. 4 B. 5 C. 6 D. -5
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Provide an appropriate response.State the formulas for the area of a triangle ABC that were derived using the law of sines.
What will be an ideal response?
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Find the derivative of y with respect to x.y = -cos-1 
A. 
B. 
C. 
D. 
Mathematics