9. Jing purchased lunch for himself and his friends. If the lunch cost $27.53 how much change will Jing get if he pays for the lunch with a $100 bill?
A. $73.53 B. $72.53 C. $73.47 D. $72.47 E. $27.47

Please show the work

The answer is D

Step-by-step explanation:

Because 100 minus 27.53 equals 72.47 which is D.

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

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