7 - 2x = 11 What is the value of x? Show your working.
2 answers:
You might be interested in
Answer:
Step-by-step explanation:
A math class has 5 girls and 5 boys in the seventh grade, 10 students in total. The probability of choosing one girl from this class is
A math class has 5 girls and 7 boys in the eighth grade, 12 students in total. The probability of choosing one girl from this class is
The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. The probability that the students she selects are both girls is
Answer:
OPTION C: Sin C - Cos C = s - r
Step-by-step explanation:
ABC is a right angled triangle. ∠A = 90°, from the figure.
Therefore, BC = hypotenuse, say h
Now, we find the length of AB and AC.
We know that:
and
Given, Sin B = r and Cos B = s
⇒
⇒
Hence, the length of the side AC = rh
Now, to compute the length of AB, we use Cos B.
⇒
Hence, the length of the side AB = sh
Now, we are asked to compute Sin C - Cos C.
⇒
= s
Sin C = s
⇒ Cos C =
Therefore, Cos C = r
So, Sin C - Cos C = s - r, which is OPTION C and is the right answer.