Width= 14 - 2= 12
length= 11 - 3 = 8
perimeter= 12+8+12+8= 40
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<h3>Area of parallelogram </h3>
.
<h3>around of parallelogram</h3>
Answer:
I'm pretty sure you just divide 31 with 20 and then you get 1.55 and after you get 1.55 you multiple that by 100 to get 155% which will be the percent you need
Step-by-step explanation:
Cost of using the smaller tiles
Area = 210 * 90 = 18,900
Total number of tiles required = 18,900 / 100 = 189
That is 5/7 * 189 = 135 white tiles and 54 coloured tlles
Cost = 135*3.99 + 54*4.99 = £808.11
Larger Tiles:-
Total numbers of tiles = 18,900 / 225 = 84
= 5/7 * 84 = 60 white tiles and 24 coloured tiles
Cost = 60*8.99 + 24 * 9.99 = £779.16
So using the 15 cm square tiles would be cheaper.
Answer:
a) r=-0.00012097
b)
c) 13,304.65 years
Step-by-step explanation:
a)
Q(t) satisfies the differential equation Q'(t) = rQ(t), hence
Integrating on both sides
where C is a constant. Taking the exponential on both sides
In this case, is the initial value Q(0), the amount of the initial value of carbon-14 and we have
As we know that the half-life of carbon-14 is approximately 5,730 years we have
Taking logarithm on both sides
and
b)
c)
We want to find a value of t for which
Q(t) = 20% of =
and