The double number line shows that 44 4 bottles of water cost 1010 10 dollars at a music festival. 00 0 44 4 bottles\text{bottles} bottles 00 0 1010 10 dollars\text{dollars} dollars based on the ratio shown in the double number line, how much does 33 3 bottles of water cost?

 7.5 dollar.

Step-by-step explanation:

Since, here the cost of 4 bottle of waters = 10 dollars.

Therefore, the cost of 1 bottle of waters = =

Thus, the cost of 3 bottle =

=

= 7.5 dollars.

So, the cost of 3 bottle is equals to $ 7.5.

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

all you should have to do is insert 1 where the c is, representing that one car is sold.

f(c) = 250c + 500

f(1) = 250(1) + 500

f(1) = 250 + 500

f(1) = 750

he earns $750 for each car sold.

hope this you! have a happy , here's a turkey!