The scatter plot shows the number of dvds aaron sold in different months:

plot ordered pairs 1, 20 and 2, 50 and 3, 80 and 4, 110 and 5, 140

what is the approximate predicted number of dvds aaron will sell in the 13th month?
380
390
400
420

The correct option is 1.

Step-by-step explanation:

The given ordered pairs are (1,20), (2,50), (3,80), (4,110) and (5,140).

It is a linear function, because for the value of function increased by a constant rate.

If a line passing through two points then the equation of line is

The equation for given data is

The required function is

At x=13,

The approximate predicted number of DVDs Aaron will sell in the 13th month is 380.

Therefore correct option is 1.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

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