Math- operation with Functions

Please show all clear steps, thank you.

For each of the following function, find:

a) (f+g)(2) b) (f-g)(-3) c) (f/g)(-4)

1) f(x) = -2x+3 and g(x) = -1/2

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For each of the following function find:

a) (f+g)(x) b) (f-g)(x) c) (fg)(x) d) (f/g)(x)

Write each function in simplest form and write down the restrictions, if any.

2) f(x) = 3 root x then +1 and g(x) = -2 root x

請各位大大幫幫助，仲有想問下呢d數學題係屬於中學幾年級？謝謝！^^