Robbie pays 10.80 dollars when he buys 3 notebooks and 4 pencils Paniz pays 14.50 dollars when he buys 5 notebooks and 2 pencils

Write down simultaneous equations and use them to find the cost of a notebook and the cost of a pencil.

Answer :
Let x = price of 1 notebook
Let y = price of 1 pencil
Change to dollars into cents then back to dollars
3x +4y = 1080
5x + 2y = 1450
- To make 2y equal to 4y multiply equation 2 by 2
New Equations :
3x + 4y = 1080
10x + 4y = 2900
Subtract to remove y :
-7x = -1820
-1820 / - 7
X = 2.6 dollars / 260 cents
To find y replace x with 260
3(260) + 4y = 1080
780 + 4y = 1080
Y = 0.75 dollars / 75 cents

function 2 has a greater rate of change than function 1

function 2 has a greater y-intercept than function 1

step-by-step explanation:

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

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