Answer:
See explanation
Step-by-step explanation:
Given that the equation for the firecracker is h = − 5 t^2 + 30 t + 20
It is impossible to solve this question unless the height (h) in meters is supplied. If the height was supplied, we could set up the quadratic equation and solve it yielding two values for the time. The values of t obtained is the time in seconds required for the firecracker to reach the given height h.
You can apply these tips and solve the question seamlessly.
The resulting expression is -9.661
<h3>Solving by substitution</h3>
Given the expression below;
-a+(-b)
Given the following
a = 6.05
b = 3.611
Substitute the given parameters into the formula
-a+(-b) = -6.05 + (-3.611)
-a+(-b) = -6.05 - 3.611
-a+(-b) = -9.661
Hence the resulting expression is -9.661
Learn more on substitution method here; brainly.com/question/22340165
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There would be 27 inches because a yard is equal to three feet or 36 inches so 36 times .75 is 27.