Answer:
B = 60°; c = 30; b = 25.98
Step-by-step explanation:
1. Calculate ∠B
∠A + ∠B + ∠C =180°
30° + ∠B + 90° = 180°
∠B + 120° = 180°
∠B = 60°
2. Calculate c
sinA = a/c
sin30° = 15/c
½ = 15/c
c = 2 × 15 = 30
3 .Calculate b
sinB = b/c
sin60° = b/30
√3/2 = b/30
b = (30√3)/2 = 15√3 = 25.98
Is this an a level question...
Let n be unknown number, then 1/5 of this number is 1/5n. When you add these two numbers, you get
You know that this sum is equal to 24, so
1. Multiply this equation by 5:
2. Solve it:
Answer: n=20, correct choice is B.
Both powers should be in the denominator with positive exponents.
