Answer: 1:1
Step-by-step explanation:
Let r be the radius and h be the height of a cylinder.
Formula: Curved surface area of cylinder = 
Now, if radius of a cylinder is doubled and its height is halved, then new radius will be R= 2r and new height will be 
Now, new surface area = 
Ratio of curved surface areas : 
Hence, the ratios of their surface areas = 1:1 .
Answer:
x=0.69897009
Step-by-step explanation:
expand by logarithms
10^x=5
=log(10^x)=log(5)
=x log(10)=log (5)
log base 10 of 10 is 1
x.l =log(5)
multiple bothside by 1
x=log(5)
x=0.6989709
Answer:
The constant of proportionality is 54.
k = 54
c as a function of d:


Step-by-step explanation:
We are given the following in the question:
c is inversely proportional to the square of d.

When c = 6, d = 3.
Plugging the values, we get,

Thus, the constant of proportionality is 54.
c as a function of d can be written as:

We have to find value of c when d = 7.
Putting values, we get,

is the required value of c.
I believe (a+b)^5 would be the answer