I got:
37 times 3.79 = 140.23
You may need to verify.
Question is a little uncertain with the number in parentheses but if Jill spent 3/4 hour and Jack 3/4 of her time then multiply together 3/4 x 3/4=9/16 of an hour.
If your saying that Jill spent 9 and 3/4 hours and jack spends 1 3/4 as much time you still multiply but change to improper fraction first. Jill spent 9 x 4 + 3 hours which equals 39/4 hours and Jack spends 1 x 4 + 3= 7/4 as much time, now multiply
39/4 x 7/4=273/16, now reduce, 17 and 1/16
Answer:
-1280
Step-by-step explanation:
There are 2 ways you could do this. You could just do the question until you come to the end of f(4). That is likely the simplest way to do it.
f(1) = 160
f(2) = - 2 * f(1)
f(2) = -2*160
f(2) = -320
f(3) = -2 * f(2)
f(3) = -2 * - 320
f(3) = 640
f(4) = - 2 * f(3)
f(4) = - 2 * 640
f(4) = - 1280
I don't know that you could do this explicitly with any real confidence.