Derivatives

The problem is in JPEG, thank you.

integration trouble

How do you integrate: [a^x exp(-a) ] / x ! (The ^ represents 'to the power of ' so a^x implies a raised to the power x)

Help me please.

1) Differentate the equations a) y=8/5xsquared b) y=4cosX - 3ex 2)The fomula C=60=t3/12 This equation refers to a machine in a workshop. This machine costs £C to lease each week according to the formula and t is the number of houre per week worked by the machine. The rate of increase of cost during the week is given by dC ...continues

Help me :<)

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polar coordinates

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iterated integral

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Evaluate the integral

Evaluate the integral of dA over the region R where R is the portion of the ellipse 4x^2+9y^2=36 in the first quadrant.

vector field

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determin the gradient

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Find a function

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