Answer:
-3 x 1 ??
Step-by-step explanation:
y is where line x and line y meet (i think ??). They want y - 3. y is vertical, and negative is down from the x-y intersection. So go down 3 spots to -3. ??
Go to the x-y intersection again. This time they want 1/2 (x + 2). So at positive 2 on the x line. 1/2 of that is at positive 1 on the x line.
??
Answer:
72
Step-by-step explanation:
12 pieces of ribbon was 6 inch long so you would multiply 12 and 6 and get 72 and that's how much she started with.
Multiplication. In the case of 2x, you multiply x by 2.
There are 60 minutes in an hour so if you divide 60 by 4 you get your 1/4 of an hour which is 15. You can check by doing 15+15+15+15
<h3>
Answer: Theta = 13 degrees</h3>
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Rule:
If cos(A) = sin(B), then A+B = 90
This can be proven through the use of drawing a right triangle with acute angles A and B. Let's say C is the 90 degree angle.
Then note how cos(A) = adjacent/hypotenuse = AC/AB while sin(B) = opposite/hypotenuse = AC/AB. We see that both evaluate to AC/AB. So this confirms cos(A) = sin(B) is true.
The condition that A+B = 90 is from from the fact that any pair of acute angles of a right triangle are complementary angles.
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Using that rule, we can say
cos(77) = sin(theta)
leads to
77+theta = 90
and that solves to
theta = 90-77 = 13