The average cost of a car in 1990 was $9,437 and the average cost of a car in 2018 was $36,113. Which of the following graphs compares these totals more accurately? ( stem, leaf) display

A would be more accurate

Step-by-step explanation:

In 2018 the price of a car is $36,113 while it costs $9,437 in 1990. This means that the price increased from 1990 by;

= 36,113/9,437

= 3.8 times.

With the x axis already representing time, the y axis will represent price. Looking at the back of the cars(y axis), Graph A would therefore be more realistic as the car in 1990 looks almost 4 times as small as the car in 2018 unlike Graph B that has the 1990 car looking about 3 times smaller.

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

answer:   2 multiplied by x =24

step-by-step explanation: