Answer:
the answer is A.
Step-by-step explanation:
the slope is 4 and the y-intercept is -2
Number of problems on the test
Students intelligence
Answer to 21 5 stands for left handers and 8 for right handers. Their are 45 left handers. 45/5 is 9. 9 times 8 is 72. for section b 5+8 is 13 so the answer is 5 over 13. Answer to 24 the table goes 1:5:7, 2:10:14,3:15:21, 4:20:28 on 7 graders the open spaces are 14 and 21 so their is 7 seventh graders for each moral. Their are 5 6th graders because on the first space their are 5 and it is one moral.
I can’t see the table, more info plz
Answer:
3/5
Step-by-step explanation:
We need to use the trig identity that cos(2A) = cos²A - sin²A, where A is an angle. In this case, A is ∠ABC. Essentially, we want to find cos∠ABC and sin∠ABC to solve this problem.
Cosine is adjacent ÷ hypotenuse. Here, the adjacent side of ∠ABC is side BC, which is 4 units. The hypotenuse is 2√5. So, cos∠ABC = 4/2√5 = 2/√5.
Sine is opposite ÷ hypotenuse. Here, the opposite side of ∠ABC is side AC, which is 2 units. The hypotenuse is still 2√5. So sin∠ABC = 2/2√5 = 1/√5.
Now, cos²∠ABC = (cos∠ABC)² = (2/√5)² = 4/5.
sin²∠ABC = (sin∠ABC)² = (1/√5)² = 1/5
Then cos(2∠ABC) = 4/5 - 1/5 = 3/5.
