What is the simplest form of the ratio 40:16

Write a story that matches with the expression 42x-5 pls hurry

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

The students in a class were asked how many siblings they have. the data obtained is represented in the dot plot. the number of students who have no siblings is . the number of students who have three or more siblings is .