Answer: D
Step-by-step explanation:
12 students
40% earned a B; 20% earned an A, so (40%+20% =) 60% got a "B or better."
60% of 20 students is ...
... 60/100 × 20 students = 1200/100 students = 12 students
Answer:
7. N. 2x-16
8. Y. 4x+20
9. A. 9x-28.8
10. T. 7x-4
11. S. 6x+54
12. N. 8x+6
13. O. 7x+9
14. N. 7x
15. T. 10x+50
16. W. 4x+15
17. I. 5x+26
18. U. 33/5x-12
19. C. 2.8x-7.56
20. O 10/3x+1/6
Step-by-step explanation:
sec(90-A) . Sin A = cot (90-A) . tan(90-A)
cosec X sinA = tanA X cotA
1/sinA X sinA = tanA X 1/tanA
1=1
Hence proved
L.H.S=sec(90-A)·sinA
=cosecA·sinA ;[sec(90-A)= cosecA]
=1/sinA·sinA ;[cosecA=1/sinA]
=1
R.H.S=cot(90-A)·tan(90-A)
=tanA·cotA ;[cot(90-A)=tanA, tan(90-A)=cotA]
=tanA·1/tanA ;[cotA=1/tanA]
=1
thus, L.H.S=R.H.S
[Proved]
how many friends does she have
Answer:
It depends how many friends there are
Step-by-step explanation:
Answer:
I guess you have to know when it will be empty
2L 1500L
1min (1500*1)/2=750min=12h30min
in 12h30min the tank will be empty
Step-by-step explanation:
Answer: The required equation of the ellipse in standard form is
Step-by-step explanation: We are given to find the equation of an ellipse in standard form with the vertical major axis of length 10 units and minor axis of length 8 units.
Since the major axis is vertical, so it will lie on the Y-axis. Let the standard form of the ellipse be given by
where the length of major axis is 2a units and length of minor axis is 2b units.
According to the given information, we have
and
Substituting the values of a and b in equation (i), we get
Thus, the required equation of the ellipse in standard form is