The length of CA is opposite of angle B and since the hypotenuse is known, you can write an equation like this: sin 40 = x/7 which simplifies to sin40 * 7 = x. The answer is A

8 0

3 years ago

The surface area, S, of a sphere of radius r feet is S = S(r) = 4πr^2. Find the instantaneous rate of change of the surface area

vesna_86 [32]

This is the derivative of S with respect to r, evaluated at r=8.
dS/dr = 8πr
Substituting r=8 into the above gives the answer of 64π.

4 0

3 years ago

Rubin has 6 rolls of pennies containing 50 coins each, 5 rolls of nickels

MArishka [77]

Answer:

C. $63.00

Step-by-step explanation:

$(6*50*0.01)+(5*40*0.05)+(4*50*0.10)+(3*40*0.25)=\\(300*0.01)+(200*0.05)+(200*0.10)+(120*0.25)=\\3+10+20+30=\\13+20+30=\\33+30=\\63$

He has C. $63.00.

7 0

3 years ago

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