Answer: x=5
Step-by-step explanation:
5 x 5 = 25 - 7 = 18
so x=5
Answer: F(x)=24
Step-by-step explanation:
f(x)=5(-3)^2+7(-3)
f(x)= 5(9)+7(-3)
f(x)=45-21
f(x)=24
Answer:
answer is a
Step-by-step explanation:
Answer:
the answer is b
Step-by-step explanation:
-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.
