Answer:
The focus is: 
Step-by-step explanation:
Given
Required
Determine the focus
The focus of a parabola
is:
So, we have:
Cross multiply
Rewrite as:
Rewrite as:
Express 8 as 4 * 2
By comparison with:
So, the focus is:
Answer:
9. B, C, D
10. A, D, E
Step-by-step explanation:
9. A. Students who bring lunch do not represent cafeteria purchases.
B. - D. Are randomized.
10. A. 1/4 of 50 is 12.5. about equal to 12
B. 12% of 50 is 6. not equal to 12
C. 12 ÷ 50 = 24. 3,000 × 0.24 = 720. not less than 500
D. (see above work) 720 = 720
E. 3,000 - 720 = 2,280. more than 2,000
Answer:
Rs 1504
Step-by-step explanation:
Mr. Rai buys for Rs 1880.
He sells it to Mr. Sherpa at 20% discount.
1880 × 20%
= 376
1880 - 376
= 1504
Mr. Sherpa buys it for Rs 1504.
Answer:
60
Step-by-step explanation:
Simplify the following:
4×9^2/27×5
9^2/27×5 = (9^2×5)/27:
4×(9^2×5)/27
4×(9^2×5)/27 = (9^2×5×4)/27:
(9^2×5×4)/27
9^2 = 81:
(81×5×4)/27
81/27 = (27×3)/27 = 3:
3×5×4
3×5 = 15:
15×4
15×4 = 60:
Answer: 60
