For this item, I would assume that we asked to determine the angular deceleration of the fan. This could be answered through the equation,
d = (V² - v²) / 2a
where d is the number of revolutions made, V is the initial angular velocity, v is the final angular velocity, and a is the deceleration. Substituting,
1500 = (850² - 0²) / 2(a)
a = 240.83 rev/min
Thus, the fan's speed decreases by 240.83 rev/min.
Answer:
D
Step-by-step explanation:
Value of n is 7
Step-by-step explanation:
-6(2n - 7) + 2(n - 4) = -36
-12n + 42 + 2n - 8 = -36
-10n + 34 = -36
-10n = -70
⇒ n = 7
Let f and b be the cost of foil and batteries respectively. We are first given that:
2f+3b=21 subtract 3b from both sides
2f=21-3b divide both sides by 2
f=(21-3b)/2
Then we are given:
5f+2b=25, using f found above in this equation gives you:
5(21-3b)/2+2b=25
(5(21-3b)+4b)/2=25 multiply both sides by 2
5(21-3b)+4b=50 carry out indicated operations on left side
105-15b+4b=50 combine like terms on left side
105-11b=50 subtract 105 from both sides
-11b=-55 divide both sides by -11
b=5, since f=(21-3b)/2
f=(21-3*5)/2
f=3
So batteries cost $5 and foil cost $3.
