Yes limit exist a discontinue
X = cost of children's ticket
x +3 = cost of adults tickets
100x + 200(x+3) = 2100
100x + 200x + 600 = 2100
300x = 1500
x = 5
answer
children ticket costs $5
If you convert it to a scientific notation it should be written out
7.962*10^-1.
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10. The sign of the exponent will depend on the direction you are moving the decimal.
I hope this helps.
