Question

help calc!!

Answer 1

@3mar

Answer 2

really not sure about this one....

Answer 3

well @3mar :-)

Answer 4

can you give a hint?

Answer 5

i think it is D.. what do you think??? Message me please

Answer 6

@3mar

Answer 7

so do you now this one?

Answer 8

@jim_thompson5910 please helP!

Answer 9

Hint: here's the graph of the piecewise function (I used geogebra to graph)


See attached

Answer 10

@jim_thompson5910 ??? i still don't know..

Answer 11

what's the highest point shown on that graph?

Answer 12

12 @jim_thompson5910

Answer 13

yes that's the final answer. The point I'm asking about is (4,12)

but y = 12 is the y coordinate they want

Answer 14

plug in 4, out comes 12

12 is the largest output

Answer 15

well what about these 2...am i right in the second one?? and i have no clue about the first

Answer 16

@jim_thompson5910

Answer 17

show me what you have for problem 3

Answer 18

i have nothing so far.... but am i right on 4??

Answer 19

let me check

Answer 20

#4 is correct. Nice work

Answer 21

what about 3... thank you by the way:-)!

Answer 22

Let
x = short side of the rectangle
y = long side of the rectangle
Let's make the long side be along the river



we have 2 sides of x and 1 side of y. The perimeter is therefore


P = 2*x + y
1200 = 2*x + y ... plug in P = 1200 (given amount of fencing)
y = 1200-2x
y = -2x+1200


Let
f(x) = area of the rectangle

area = f(x)
area = (length)*(width)
area = x*y
area = x*(-2x+1200)
area = -2x^2+1200x


So,
f(x) = -2x^2+1200x
will be used to help figure out the max area