SOLUTION: Here are my questions there are only 3 I couldnt delete the extras I only need one thru three which are due Monday. Thanks 1. Simplify and evaluate: (x7y-4z0/5-2x3y-8z

Algebra ->  Linear-equations -> SOLUTION: Here are my questions there are only 3 I couldnt delete the extras I only need one thru three which are due Monday. Thanks 1. Simplify and evaluate: (x7y-4z0/5-2x3y-8z      Log On


   

Question 79978: Here are my questions there are only 3 I couldnt delete the extras I only need one thru three which are due Monday. Thanks



1. Simplify and evaluate:
(x7y-4z0/5-2x3y-8z-9)2


2. Convert to scientific notation (here you may use x as multiplication):
0.00452


3. For f(x) = 5x – 4, find f(-1).






1. Simplify and evaluate:
(x7y-4z0/5-2x3y-8z-9)2


2. Convert to scientific notation (here you may use x as multiplication):
0.00452


3. For f(x) = 5x – 4, find f(-1).



Here are my questions i need help with they are due monday and i need a break down so i can learn the process for solving. Thank you
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
1. Simplify and evaluate:
(x7y-4z0/5-2x3y-8z-9)2
:
This is so ambiguous it could be:
:
%28%28%28x%5E7%2Ay-4z%5E0%29%29%2F%28%285-2x%5E3y-8z-9%29%29%29%5E2
:
you can't do very much with this so maybe you mean:
:
%28%28%28x%5E7%2Ay%5E-4%2Az%5E0%29%29%2F%28%285%5E-2%2Ax%5E3%2Ay%5E-8%2Az%5E-9%29%29%29%5E2
:
any number ^0 is 1 so we can get rid of z in the numerator
:
%28%28%28x%5E7%2Ay%5E-4%29%29%2F%28%285%5E-2%2Ax%5E3%2Ay%5E-8%2Az-9%29%29%29%5E2
:
Change the exponents signs when you move terms from the denominator to the numerator
%285%5E2%2Ax%5E7%2Ax%5E-3%2Ay%5E-4%2Ay%5E8%2Az%5E9%29%5E2
:
Combine like terms, add the exponents
%2825%2Ax%5E4%2Ay%5E4%2Az%5E9%29%5E2
:
Square each term, multiply each exponent by 2
625%2Ax%5E8%2Ay%5E8%2Az%5E18
:
It's simplified but can't evaluate because we don't know the value of the variables.
:

2. Convert to scientific notation (here you may use x as multiplication):
0.00452
:
Move the decimal point to the right between the 1st and 2nd significant digits;
"tenths, hundredths, thousands" which would be 10%5E-3
WE then have 4.52%2A10%5E-3



3. For f(x) = 5x – 4, find f(-1).
:
f(-1) just means you substitute -1 for x evaluate:
f(-1) = 5(-1) - 4
f(-1) = -5 -4
f(-1) = 9
:
When the problems are ambiguous, it discourages tutors from choosing to help you. When in doubt, use brackets.