Answer:
Option B. 1.8 seconds
Step-by-step explanation:
h=-16t^2+56t+1
This is a quadratic equation, and its graph is a parabola
h=at^2+bt+c; a=-16, b=56, c=1
Like a=-16<0 the parabola opens downward, and it has a maximum value (height) at the vertex, at the abscissa:
Replacing the known values:
Approximately 1.8 seconds.
Answer: It takes approximately 1.8 seconds the airplane to reach its maximum height.
With the help of the ratio method, we conclude that 72 grams of sugar should be added.
<h3>What is Ratio Method?</h3>So, 'n=5' will be the number of rings.
Let 's' be silver. Then,
Now, use the ratio method as follows:
Therefore, with the help of the ratio method, we conclude that 72 grams of sugar should be added.
Know more about Ratio Method here:
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The correct question is given below:
A jeweler has five rings, each weighing 18 grams, made of alloys of 10% silver and 90% gold. He decides to melt down the rings and add enough silver to reduce the gold content to 50%. How much silver should he add?