Answer:
Sara is now 4, will be 8 in 4 years. Ralph is now 12, will be 16 in 4 years.
Answer:
10-10+10÷10×10
Step-by-step explanation:
10-10=0+10=10÷10=1×10=10
Step-by-step explanation:
We have,
Applying on both sides of equation (i) we get :
We know that,
So,
Also,
So,
Similarly,
Applying on both sides of equation (ii) we get :
We know that,
The cosine function is positive in the first and fourth quadrant.
So,