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Svet_ta [14]
3 years ago
8

Simplify (3x2-5xy+2y2)-(7x2-3xy-3y2)

Mathematics
2 answers:
stellarik [79]3 years ago
7 0
The answer is:
-4x^2 -2xy + 5y^2
scoray [572]3 years ago
6 0
Https://www.tiger-algebra.com/drill/(3x~2−5xy_2y~2)−(7x~2−3xy−3y~2)/
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: If tan A=- 9/13 and 0 < A < 180, find, without using tables or calculators, the value of
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Answer:  \bold{\sin A=\dfrac{9\sqrt{10}}{50}\qquad \cos A=-\dfrac{13\sqrt{10}}{50}}

<u>Step-by-step explanation:</u>

0° < A < 180° so it is in Quadrant I or II

since tan A is negative, it is in Quadrant II ---> (-x, +y)

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Next, find the hypotenuse given that x = -13 and y = 9

(-13)² + (9)² = r²

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         5√10 = r

\sin A = \dfrac{y}{r}\quad =\dfrac{9}{5\sqrt{10}}\bigg(\dfrac{\sqrt{10}}{\sqrt{10}}\bigg)\quad =\large\boxed{\dfrac{9\sqrt{10}}{50}}\\\\\\\\\cos A = \dfrac{x}{r}\quad =\dfrac{-13}{5\sqrt{10}}\bigg(\dfrac{\sqrt{10}}{\sqrt{10}}\bigg)\quad =\large\boxed{-\dfrac{13\sqrt{10}}{50}}

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3 years ago
The length of the hypotenuse of a 30-60-90 triangle is 11 find the perimeter
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Work is shown in the photo!
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What is the probability of spinning the spinner and it landing on a VOWEL?
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Answer:

B

Step-by-step explanation:

The inequality is 1.20$ x + 3.60 < 9.60, the amount of money in total that Rammy has. As said, for each pound of peaches it would cost 1 dollar and 20 cents (1.20) So for the gallon of milk if Rammy bought it he would have 6$ left to spend on the pounds of peaches. So you do 6$ (600) divided by 1.20$  (120) and you would get 5 pounds of peaches. Therefore, Rammy can buy 5 or more pounds of peaches.

6 0
3 years ago
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