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eimsori [14]
3 years ago
14

Jenna was 4 4/6 feet tall last year. This year she is 5 2/6 feet tall. How many feet did Jenna grow in the past year

Mathematics
2 answers:
kompoz [17]3 years ago
8 0
You could turn the mixed fractions into improper fractions so 4 4/6 would become 28/6 and 5 2/6 would become 32/6. Then you can subtract 32/6 by 28/6 which would be 4/6 simplified into 2/3
oee [108]3 years ago
5 0
You want to subtract the heights. 5 2/6-4 4/6=5 1/3-4 2/3=2/3.
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The height H of an ball that is thrown straight upward from an initial position 3 feet off the ground with initial velocity of 9
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Answer:

The ball will be 84 feet above the ground 1.125 seconds and 4.5 seconds after launch.

Step-by-step explanation:

Statement is incorrect. Correct form is presented below:

<em>The height </em>h(t)<em> of an ball that is thrown straight upward from an initial position 3 feet off the ground with initial velocity of 90 feet per second is given by equation </em>h(t) = 3 +90\cdot t -16\cdot t^{2}<em>, where </em>t<em> is time in seconds. After how many seconds will the ball be 84 feet above the ground. </em>

We equalize the kinematic formula to 84 feet and solve the resulting second-order polynomial by Quadratic Formula to determine the instants associated with such height:

3+90\cdot t -16\cdot t^{2} = 84

16\cdot t^{2}-90\cdot t +81 = 0 (1)

By Quadratic Formula:

t_{1,2} = \frac{90\pm \sqrt{(-90)^{2}-4\cdot (16)\cdot (81)}}{2\cdot (16)}

t_{1} = 4.5\,s, t_{2} = 1.125\,s

The ball will be 84 feet above the ground 1.125 seconds and 4.5 seconds after launch.

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