拜託大家幫幫我幾個微積分的問題----------很急><"

我想問大家幾個微積分的問題
這是我妹的考試題目
但是他實在不會
拜託大家幫幫我；
1.Find the equation of the curve that has the given slope and passes through the given point
1)slope e* and through (0,1)
2)slope 2e* and through (0,3)
<*代表x>

2.Determine the cost function C(x) that corresponds to the marginal cost given
1)Marginal cost=2/√x , fixed cost=$10

3.If the marginal cost when x units are produced is 100-0.50x dollars and the overhead is $40 , what is the cost of producing 10 units?

4.If x lamps can be supplied at 20e* do;;ars each and sold at $ 25 each, find the profit function.<*代表-0.3x>

5.Suppose x units of a product can be supplied at a cost of 30e* dollars each
1)Determine the cost function C(x)
2)Determine the cost of 5 units
<*代表*0.2x>

6.Let R(x) be the revenue a company receives from the sale of x units of its product. If its marginal revenue R'(x) is 100-0.2x dollars,determine 1)R(x)
2)The revenue from the sale of 20 units
Assume there is no revenue when zero units are sold.

真的拜託大家了....
謝謝大家的幫忙