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

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.

students group

step-by-step explanation:

a person who   joins a party or a seminar can explain his feelings about that particular occasion better more than anyone else.

as bella managed a show for the students in the school and invited students to watch that show

hence

students group will be the best group to survey to find this information