Asked by Mike

can anyone help me with my math please?
Answered by Ms. Sue
Please post the problem that's giving you trouble and explain what you don't understand. Someone will be glad to help you.
Answered by Mike
I am having trouble setting up this equation. Can you assit me ?

[CUBERT(2x + 9)]=3
Answered by DrBob222
Cube both sides.
Solve for x.
Answered by Mike
Would cube mean mutiplu by 3?

By the way thank you dr bob for all of your help. I really appreciate it.
Answered by Damon
No, multiply by itself twice, not by three. Cube means to the third power.
Answered by Mike
Ok thanks. also do you know how to solve this ??

y= 2[SQRT(x - 1)]

This is what I am being asked

Give the domain (that is, possible values of x):
Answered by DrBob222
To amplify a little.
3^2 = 3*3 = 9
3^3 = 3*3*3 = 27
3^4 = 3*3*3*3 = ?? you get the idea.
Now, sqrt 9 = 3
cube rt 27 = 3
One more:
sqrt(x+2)^2=x+2
OK?
Answered by Mike
Thank you. IS this the problem I just sumbittted to you?? and if so how do I get to that??
Answered by DrBob222
Notice that when you square the square root of something, you just move the something out of the square root.
sqrt (x+2)^2 = x+2
same for cubing a cube rt.
cube rt (x+3)^3 = x+3

As for the y = 2*sqrt(x-1), do it the same way by squaring both sides, then factor. At least that's what I would do. Damon is the expert with this, not I.
Answered by Mike
Thank you
Answered by Mike
ALSO LET ME ASK you if you know the answer to this word problem...How would I solve this one...IF you are still there..because i notice that you are very talented at the cubert thing.



How tall is a stack of cube-shaped blocks whose volumes are 375 cubic inches, 648 cubic inches and 1,029 cubic inches?

The answer choice is

A10 cubert(3)
B6 cubert(3)
C3 sqrt(3)
D4 sqrt(3)
E9 sqt(3)
F18 cubert(3)
Answered by bobpursley
find the edge length of each
E1=cbrt375=7.2
E2=cbrt648=8.65
E3=cbrt1029=?

now add the three edge lengths, and you have the height.

To get a cbrt on your calculator, do this

1029 y<sup>x</sup> (1/3)=

and y<sup>x</sup> is a key on your calculator.

To get it on the google calculator, paste the following in your google search engine window on your internet browser.

1029^(1/3)
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