Mathematics
Calculus
Let f: R→R 2. Prove that f is differentiable

Let f: R→R 2. Prove that f is differentiable

Let f: R→R 2. Prove that f is differentiable at a € R if and only if f 1 and f 2 are, and in this case
f 1(a) = ((f 1)1 (a) (f 2)1 (a)).

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Sample Text: Please assist me with this math problem. I am having difficulties. Thank You!? Homers Pizza is advertising the following deal:3 pizzas, up to 4 toppings each, 10 toppings to choose from 3 soft drinks, 5 varieties to choose from total cost $24.99. The pizza toppings must be unique double, triple, or quadruple toppings are not allowed.
How many integer solutions are there to the equation
x1 + x2 + 2x3 + x4 + x5 = 72
when
(a) xi 0,i = 1,...,5
(b) xi 1,i = 1,...,5

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Let f: R→R 2. Prove that f is differentiable

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