Rob is saveing to buy a new mp3 player for every 14 dollars he earns babysitting ,he saves 5 dollars on saturday rob earned 84 dollars babysitting how much money did he save .

Rob saved $30 to buy new Mp3 player.

Step-by-step explanation:

Given:

Rob is saving money to buy a new Mp3 player.

For every $14 earned he saved $5.

For 14 dollars earned = Money Saved $5

Total money earned in babysitting = $84  

We need to find Total money he saved.

Now 14 dollars earned = Money Saved $5

So 84 Dollars earned = Total Money saved

We will use Cross Multiplication method to find the Total Money saved.

Total Money Saved =

Hence Rob saved $30 to buy new Mp3 player.

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation: