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atroni [7]
2 years ago
15

A TV cost $420 but is on sale with 20% off. What is the new sale price before tax? Calc

Mathematics
1 answer:
My name is Ann [436]2 years ago
3 0
336 because 20% of 420 is 84 so you subtract that from 420 which gives you 336
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What equation is equivalent to x2 + 20x + 81 = -27? Can you show me how you got the answer please
Alla [95]

The equivalent equation is x² + 20x = -102

<h3>Simplification of quadratic equation</h3>

The equivalent equation can be obtained by factorizing or simplifying the given quadratic equation as shown below;

x² + 20x + 81 = -21

<em>collect similar terms together</em>

x² + 20x + 81 + 21 = 0

x² + 20x + 102 = 0

The equation can also be written as x² + 20x = -102

Thus, the equivalent equation is x² + 20x = -102

Learn more about simplification of quadratic equation here: brainly.com/question/1214333

4 0
2 years ago
The volume of a cone is 3 cubic units and its height is x units. Which expression represents the radius of the cone base, in uni
yKpoI14uk [10]
Cone Volume = (PI * radius^2 * height) / 3
3 = (PI * radius^2* x) / 3
radius^2 = 9 / (PI * x)
radius = square root (9 / (PI * x))



6 0
3 years ago
Read 2 more answers
Galileo wanted to release a wooden ball and an iron ball from a height of 100 meters and measure the duration of their fall. He
ICE Princess25 [194]
For this case what you have is the same as a rectangle triangle where you have as data the degree of inclination of the hypotenuse with respect to the base and the height of the triangle.
 We have to find the value of the hypotenuse.
 For this we use the following trigonometric relationship:
 senx = C.O / h
 Where
 x: angle
 C.O: opposite leg
 h: hypotenuse.
 Substituting the values we have:
 sen (12) = 100 / h
 We cleared h:
 h = 100 / sin (12)
 h = 480.97 m
 Answer: 
 Galileo should walk 480.97 m up the inclined plane
5 0
4 years ago
Jerry has 6 candys he lost 2 how much does he have?
Aleksandr-060686 [28]

Answer:

Hello there!

Since he had 6 candies and lost two, all you have to do is subtract 2 from 6.

Therefore, Jerry only has 4 candies.

Hope this helps!!!

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Melanie invested $9,800 in an account paying an interest rate of 4.5 compounded quarterly. Amelia invested $9,800 in an account
Zolol [24]

Answer:

$13,082.60 more

Step-by-step explanation:

Melanie:

A=P(1+\frac{r}{n})^(20)\\ A=9800(1+\frac{.045}{4})^(20)\\A=$12,257.36

Amelia:

A=Pe^(rt)\\A=9800e^(.0475*20)\\A=$25,339.95

Amelia-Melanie= $13,082.60

6 0
3 years ago
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