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Tanya [424]
3 years ago
9

Solve using the quadratic formula. 7q² – 9q- 1=0

Mathematics
1 answer:
Mama L [17]3 years ago
6 0

Answer:Q=1.39 or -0.103

Step-by-step explanation:

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The value of 2 in 2,783 is thousand. The value of 2 in 7,283, is hundred. 
So it is one times the value.
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Sam painted 3 pictures.ellie painted twice as many pictures as Sam how many pictures did they paint altogether
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Sam painted 3
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Solve each inequality.<br> X+5 &lt; 6 <br> Pls help
agasfer [191]

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x<1

Step-by-step explanation:

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1 year ago
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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
mariarad [96]

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.

3 0
2 years ago
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