# math 3 questions

**Question description**

i need them in max 1 hr.

3- find the sum sigma from infinity to n=1 (n/2^n)

4-
find the area of surface obtained by rotating the curves x=3t+,
y=4t+7, t less than or equal 1, and bigger or equal than 0 about
x-axis.

5- let R be the region enclosed by the curves y=10-x^2
and y=x^2. Use the following method to set up an integral , but do not
evaluate.

a- the volume of the solid obtained by rotating R about the y=18. ( use 7.2 method, calculus 2)

b- the volume of the solid obtained by rotating R about the x=2 ( use 7.3 method)

c- area of R

thanks

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