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3 years ago

What is the quadratic formula? Can you help me with an example please?

1 answer:

3 0

Ax^2 + bx +c
Divide both sides of the equation by a, so that the coefficient of x2 is 1. Rewrite so the left side is in form x2 + bx (although in this case bx is actually ). Since the coefficient on x is , the value to add to both sides is.

Source
https://www.montereyinstitute.org/courses/DevelopmentalMath/COURSE_TEXT2_RESOURCE/U16_L5_T2_text_final.html

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A girl is flying a kite with a 120ft string attached to the ground is flying directly Selena’s head is standing 24 ft from where

SashulF [63]

Answer:

111.58 feet

Step-by-step explanation:

Given that the length of the string (AB in the attached diagram) is 120 feet.

Selena (at point D) is standing 24 feet from point A, where the kite is attached to the ground.

Since the kite is directly above Selena's head, the problem forms a right triangle.

Using Pythagoras theorem

$|AB|^2=|BD|^2+|AD|^2\\120^2=|BD|^2+24^2\\|BD|^2=120^2-24^2\\|BD|^2=13824\\|BD|=\sqrt{13824} \\|BD|=117.58$ ft$

Serena's height (CD=6 feet)

The distance of the kite above her head is BC in the drawn diagram.

Therefore:

|BD|=|BC|+|CD|

117.58=|BC|+6

|BC|=117.58-6

|BC|=111.58 feet

The kite is approximately 111.58 feet above Selena's head/

5 0

3 years ago

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rodikova [14]

Answer:

the 1st graph

Step-by-step explanation:

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3 years ago

Evaluate 12 + 10 ÷ 2 − 3.

just olya [345]

The answer would be 14.

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3 years ago

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Suppose a jar contains 8 red marbles and 10 blue marbles. If you reach in the jar and pull out 2 marbles at random, find the pro

raketka [301]

Answer: There is a 28/153 chance of both marbles you pull being red.

Step-by-step explanation: So you have 18 marbles total and 8 of them are red, so there is initially an 8/18 or 4/9 chance of pulling the first red marble. After this there is 1 less red marble in the jar so 7 out of 17 marbles are red. Now you have to multiply the fractions 4/9 and 7/17, which gives you 28/153

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3 years ago

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snow_tiger [21]

Answer:

Step-by-step explanation:

If it is 18 roses for 90 dollars, what is one rose worth?

90 dollars/18 roses=5 dollar per rose

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2 years ago