If f(X) = (Cosx - 7x^4) only one of the following is true. (reminder vs for exam

Question

If f(X) = (Cosx - 7x^4) only one of the following is true. (reminder vs for example is the same as then f = (cos - 7u^4) and u = Squarerootx If the area of a field Is given by the formula AM = x* (100-2x1 then what should we do to find the maximum area of the field? (But don't do it.) Find A"(x). set it equal to 0, solve for x, and plug the x-value into A'(x). Find A'(x), set it equal to 0, solve for x, and plug the x-value into A'(x). none of the above. 13 Let y = f(x) = 1,000*10^. Only one of the following is true. r(1,000) is close to 1,000 f(1,000) is close to 10 f'(10) is close to 1,000 f'(1,000) is close to 0

Explanation / Answer

11)f(x)=(cosx -7x4)

f= u ,u=(cosx -7x4)

12)A(x)=x*(100-2x)

to find maximum area of field

A'(x)=0, A"(x)<0

find A'(x),set it equal to 0,solve for x ,plug the x-value into A"(x)

13)f(x)=1000 *10-x

f(x)=1000 *(1/10)x

f '(x)=1000(1/10)xln(1/10)

f '(1000) is close to 0

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