Answer:
A. -2sin(x)sin(0.4x)
Step-by-step explanation:
At x=0, the given expression evaluates to zero.
For x near zero, the given expression is slightly negative. You know this because cos(1.4x) decreases faster than cos(0.6x), so their difference will be negative.
Of the answer choices, you can eliminate C and D because they are not zero at x=0. You can eliminate choice B, because it is positive for values of x near zero. The only viable choice is A:
-2sin(x)sin(0.4x)
___
Of course, a graphing calculator can help you figure this out. See the attachment. The given expression is plotted using a solid red line; the answer choice A is plotted using blue dots.
Hi
3 dinners at $9 each.
9 x 3
2 kids' meals at $4 each
9 x 3 + 4 x 2
4 desserts at $3 each
9 x 3 + 4 x 2 + 4 x 3
$10 dollar off coupon
9 x 3 + 4 x 2 + 4 x 3 - 10
Solve using PEMDAS
9 x 3 + 4 x 2 + 4 x 3 - 10 = ?
27 + 8 + 12 - 10 = ?
35 + 12 - 10 = ?
47 - 10 = ?
37
The answer is 37
Hope this helps! :)
$480 since the question is just is how much would the would price be after the discount (discount)
Answer:
The correct option is B) 12.
Step-by-step explanation:
Consider the provided information.
Working alone at its constant rate, pump X pumped out ¼ of the water in a tank in 2 hours.
As we know: 
,
The rate of pump X is 
of the water is pumped out of the tank, that means only 
is left to be pumped out.
All 3 pumps pumped out the remaining of the water out in 3 hours.
The combined rate of all three pumps is: 
Pump Y, working alone at its constant rate, would have taken 18 hours to pump out the rest of the water.
The rate of pump Y = 
Let z is the time taken by pump Z, then the rate of pump Z is 
.
Therefore,
Multiplying both sides by 24 z.
Hence, the correct option is B) 12.
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wpazsebu
