Use the following question to answer #14-15. Rebecca needs 10 3/4 yards of fabric to make a quilt. She has one piece of fabric that is 2 1/3 yards and another piece of fabric that is 4 1/2 yards.
0/1
How much fabric does Rebecca already have?

4.0 ft

step-by-step explanation:

4.0 ft

8

step-by-step explanation:

this is a subtraction problem.

10 - 2 = 8

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places