Answer:
x = 7
Step-by-step explanation:
-4x + 7 = -21
-4x = - 21 -7
-4x = -28
4x = 28
x = 28/4
x = 7
Answer:
Step-by-step explanation:has no solution
add 0+1+2+3+4 = 10
divide 10÷5 = 2
add 15+8+3+3+1 = 30
divide 30÷5 = 6
the ratio is 2:6 which simplifies to 1:3 by the means of lates per student. In other words there is one late per 3 students.