Think about using decimal models to show 6.84. if you only used tents, what place would you not be able to model? how many tenths would you use to model the other two places?

If we only use tenths, then we wont be able to model the hundredths place value that is the value of 4 in the given decimal.

Step-by-step explanation:

We are given the number 6.84

The place value chart for this number can be written as:

Place value:        Ones  .  Tenths  Hundredths

          6.84:             6     .       8               4

The decimal expansion can be written as:

If we only use tenths, then we wont be able to model the hundredths place value that is the value of 4 in the given decimal.

To model 4 that is 0.04, we need

To model 6, we need

c

step-by-step explanation:

at least i think its

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!