4x ≤ 12
x ≤ 3 <em>divided both sides by 4</em>
Graph: ←--------------------3 <em>(fill in the dot at 3 since it is "equal to")</em>
Interval Notation: (-∞, 3]
Answer: x ≤ 3
Answer:
26. length=7cm width=4cm
27. length=12cm width=5cm
28. length=12 cm width=9cm
29. length=7 cm
30. length=2cm
Circumference is also doubled (multiplied by 2)
-y) = cos x cos y + sin x sin y becomes, in terms of sign,
cos(x-y) = (Note that cos(x-y) = cos x cos y + sin x sin y.
If angle x is in the fourth quadrant, then sin x is positive and cos x is negative.
If angle y is in the first quadrant, then sin y is positive and cos y is positive.
Then cos(x-y) becomes, in terms of sign:
(-)(+) + (+)(+), or
(-) + (+)
This would be positive, overall, if cos x cos y < sin x sin y.
