First divide bot sides of the formula by 1/2(3.14):-
2A / 3.14 = r^2
r = sqrt (2A/3.14)
Answer:
200 pencils and 120 pens
Step-by-step explanation:
Let the number of pencils be x while pens be y.
Considering the cost of whole purchase then, we get the equation
0.5x+y=220
Considering the number of items bought, then the equation is
x-y=80
Adding the two equations then we have
1.5x=300
x=300/1.5=200
Consideeing that x-y=80 and x is 200 then
200-y=80
y=200-80=120
Therefore, the pencils were 200 and pens 120 pieces
The total cost of 12 printers is; $493.41
Cost of first printer; C1 = $54
Cost of second printer is; 95% × 54 = $51.3
Cost of third printer is; 0.95 × 51.3 = $48.735
Cost of fourth printer = 0.95 × 48.735 = $46.298
Now, let us apply same pattern using a calculator for the remaining costs and we will have them as follows;
- Cost of 5th printer = $43.983
- Cost of 6th printer = $41.784
- Cost of 7th printer = $39.695
- Cost of 8th printer = $37.710
- Cost of 9th printer = $35.825
- Cost of 10th printer = $34.033
- Cost of 11th printer = $32.332
- Cost of 12th printer = $30.715
Total cost of the 12 printers is;
54 + 51.3 + 48.735 + 46.298 + 43.983 + 41.784 + 36.695 + 37.710 + 35.825 + 34.033 + 32.332 + 30.715 = $493.41
Read more about total costs of successive items at; brainly.com/question/16082169
Answer:42, 3, 2, 15
Step-by-step explanation:
Answer:
A,C,D
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