Answer:
minus
the question is not complete
Answer:

Step-by-step explanation:
The given problem is a subtraction problem between fractions. The first step in a problem like this is to convert both fractions to a common denominator. In other words, multiply both the numerator and denominator of a fraction by the same value such that the denominator of one of the fractions is the same as the other fraction. The numerator of a fraction is the value over the fraction bar, whereas the denominator is the value under it. Multiplying any fraction by a number over itself is the same as multiplying it by one, thus, the equation will remain true, and be equivalent to the original expression.

Convert to a common denominator,


Now perform the subtraction, subtract one numerator from the other, remember, do no perfrom any more operations with the denominators,

3/10 and 4/10 and 4/12 and 9/12
At 3 seconds, the firework is at a height of 150 feet
Answer is C. third option
The firework is at a height of 150 feet