medal to whoever helps me
a box is to be constructed from a sheet of cardboard that is 20 cm by 50 cm by cutting out squares of length x by x from each other and bending up the sides. what is the maximum volume this box could have?

my answer was 1000x was wrong.

Question 2

to three decimal places , find the value of the first positive x-intercept for the function f(x)= 2cos(x+4).

a. 1.712 was my choice and was wrong
b. 0.712
c. -2.429
d. -2.712

Question

medal to whoever helps me
a box is to be constructed from a sheet of cardboard that is 20 cm by 50 cm by cutting out squares of length x by x from each other and bending up the sides. what is the maximum volume this box could have?

my answer was 1000x was wrong.

Question 2

to three decimal places , find the value of the first positive x-intercept for the function f(x)= 2cos(x+4). 

a. 1.712 was my choice and was wrong
b. 0.712
c. -2.429
d. -2.712

welshfella · Answer

volume of the box is x(20-2x)(50-2x)

this has to be a maximum

welshfella · Answer

have you done differentiation?

welshfella · Answer

what stage are you at ? Have you done any calculus?

welshfella · Answer

i'm sorry cant help you  gotta go right now