Question

PLZ PLZ HELP = MEDAL

Answer 1

which problem are you doing ?

Answer 2

I need help with all those three.

Answer 3

you should just do one problem per post (less confusing)

for the first problem, what formula should you use (they give it). what is it ?

Answer 4

V = lwh
Volume of a box 1,300 cubic inches

Answer 5

ok.
they also say the L, W and H are all the same (unknown) number (call it "x" for unknown)
if you put in x for the value of L , W and H, and replace V with 1300
what equation do you get ? any idea ?

Answer 6

ummm, I dont know

Answer 7

you start with
V = lwh

V stands for the "volume"
we know what the volume is (they tell us)
if we replace V with the number, what does the equation look like?
give it a try

Answer 8

1,300 = lwh

Answer 9

yes. next, L , W and H are all the same number (which we don't know)
if we call that number "x"
and replace L , W and H with x , what does the equation look like?
try !

Answer 10

1,300 = x ?

Answer 11

lwh means L times W times H
if each of them is "x", we won't just get a single x
try again!

Answer 12

1,300 = x*x*x

Answer 13

exactly

and if we use "exponents" (little numbers in the upper right)
do you know another way to write x*x*x ?

Answer 14

x^3

Answer 15

yes
x^3 = 1300

to "solve for x" we "take the cube root" of both sides (or use the exponent 1/3)
do you know how to do that ?

Answer 16

no

Answer 17

we would do
\[ x^3 = 1300 \\ \sqrt[3]{x^3} = \sqrt[3]{1300 }\]
or
\[ x^3 = 1300 \\ \left( x^3\right)^\frac{1}{3}= (1300)^\frac{1}{3}\]

Answer 18

either way, you get x on the left side
you need a calculator for the right side

Answer 19

or type into google
1300^(1/3)=

(notice you need to put parens around the 1/3)

Answer 20

3900

Answer 21

how did you get 3900 ?
do you have a calculator ?