Answer:
y=21
Step-by-step explanation:
y= 9 cos x =3 so y=3 when x=1 on the base level so if x=7 would be x=1 on the base level * 7 then y=3 on the base level * 7 would be y = 21
Answer:
The answer is "4.3".
Step-by-step explanation:
Given:

When
When

When
(closer to 0)
-
It changes the sign so, the root lies in 4.3 and 4.4.
When
When the root is closer to 4.3 than 4.4 So, 1.563 is closer to zero than 4.184.
When
close to zero.
So the answer is 4.3 to 1 decimal place.
Answer:
4.138138=469069/500000
Step-by-step explanation:
Answer:
8,146 x 121
Step-by-step explanation:
This is a problem in which you need to measure your understading of "orders of magnitude."
If the estimated answer is
that means that we are looking at a multiplication in the "order of" 
You need to look at the "orders of magnitude" of the things you're multiplying. In the first case, we have
that would be "of the order of"
times
. So the whole multiplication would "of the order of"
or near 
The correct answer, 8,146 x 121, is because it's "of the order of"
times
and the gives us the
we need.