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mileto1798
18.11.2019 •
Mathematics
What is the range of the relation? {(1, 2), (2, 4), (3, 2), (4, 6)}
{1, 2, 3, 4}
{1, 2, 3, 4, 6}
{2, 4}
{2, 4, 6}
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Ответ:
So ur range is { 2,4,6}...if they repeat, u only have to write them once
Ответ:
a) x = 6
b) 0.2 radians.
Step-by-step explanation:
I ran out of time and the system logged me out so I'll start again:
a) Find the lengths of the arcs in terms of x and Ф:
arc SP = radius * Ф = 10Ф
arc TS = 10*3Ф = 30Ф
arc PT = 10Ф+30Ф = 40Ф.
arc QR = (10 + x)Ф
QR/PT = 2/5 so:
2/5 = (10 + x)Ф / 40Ф
Cross multiply:
80Ф = 50Ф + 5xФ
5xФ = 30Ф
x = 6.
b)
The area of a sector = radius^2 * angle in radians.
The shaded area = area of arc QOR - area of arc POS:
31.2 = (10 + x)^2 Ф - 10^2 Ф
x = 6 so:
16^2 Ф - 100 Ф = 31.2
Ф = 31.2 / 156
= 0.2 radians.