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cadeedmiston
21.06.2019 •
Mathematics
At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.
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Ответ:
x = 150 people at dinner
Step-by-step explanation:
(2/5) x - had fish
(1/3) x - had chicken
The sum of this two fractions is: 2/5 + 1/3
First, we must bring these two fractions to the same denominator.
First fraction we will multiply with number 3 and get:
(2/5) · 3 = 6/15
Second fraction we will multiply with number 5 and get:
(1/3) · 5 = 5/15
Now we can calculate the sum of this two fraction:
6/15 + 5/15 = 11/15
The fraction of the people which had lamb is :
(4/15) x = 40 => x = 40 : (4/15) = 40 · 15/4 = 150
x = 150 people had dinner.
God with you!!!
Ответ:
The equation for a parabola with directrix y = –p and focus (0, p)
The distance between vertex and directrix is P
Also the distance between vertex and focus is also P
Focus (0,p) so focus lies on y axis
Directrix line is paralled to focus point
So Directex crosses the x axis .
Hence line of symmetry lies is the y-axis.
The graph is attached below.