The average marks of the first 10 students are 17 and that of the next 15 students is 18. find the mean of 25 students?

step-by-step explanation:

the true ones are a b and d

i'm not really sure how to answer that

step-by-step explanation:

on the middle line

step-by-step explanation:

1/5=50

2 equivalent expressions to represent the area of a rectangle and the top is n-3 and the side is 2

area of the rectangle = length * width

given length = n - 3

width = 2

replace it in the area

so area of the rectangle = (n-3) *2

= 2(n-3)

one of the expression is 2(n-3)

to get another expression we distribute 2 inside the parenthesis

2(n-3) is 2n - 6

so another expression is 2n - 6

two equivalent expression are

2(n - 3)   , 2n - 6