There are 40pupils in a class. 30 of them study Biology, 22 study Physics and 21 study chemistry,15 study physics and Biology, 10 study Physics and chemistry, 13 study biology and chemistry, 2 study physics only, 3 study chemistry only and 7 study biology only. Represent this information on a Venn diagram.
How many pupils study all the subject.
If a student is selected at random, what is the probability that he studies either physics or chemistry.​

step-by-step explanation:

when the line is solid:

when the line is dashed:

this > inequality sign means:

this < inequality sign means:

this > inequality sign means:

this < inequality sign means:

about the problem:

srry i'm not done ! i'll

hi how are you doing today? if you ever need just tell me

step-by-step explanation:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

find the vertical and horizontal asymptotes of the function f x = 5 x − 1 . to find the vertical asymptote, equate the denominator to zero and solve for . since the degree of the polynomial in the numerator is less than that of the denominator, the horizontal asymptote is .

step-by-step explanation: