MATHEMATICS COLLEGE

4y-x=2x-4=x+y
solve for x

Answers

Answer 1
Answer: X=12






Explanation: in the photo
Answer 2
Answer:

Answer:

a system of equations , as below

Step-by-step explanation:

4y-x

2x-4

x+y

use any two of the above to find a formula for one of the variables since they are all equal to each other.. btw.. it makes it much easier .. that they are all equal.  :)

2x-4=x+y ⇒ x-4=y   use this to plug into the y in the top formula

4(x-4)-x=2x-4 ⇒ 4x-16-x=2x-4 ⇒ 3x-16=2x-4 ⇒ x=12  yay! ;) now plug in 12 for x

2(12)-4=(12)+y ⇒ 24-4 = 12 +y ⇒ 8=y   yay ! now we have both x and y

x=12

y= 8

this checks by plugging in the two number found for x & y  (btw I had to try this about 4 times ) :P  I kept messing up the algebra  which is soooo easy to mess up.  

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Does sine inverse have an exponent? If not, why is there a negative one there? If so, why can't you just divide?

Answers

Answer:

see below

Step-by-step explanation:

the actual way of writing sin inverse is arcsine, not sin⁻¹

since the output of sin is from -1 to 1, the domain of arsince is from -1 to 1. This is different than 1/sin(x), whose domain is all real numbers. we now write sin⁻¹ to fit it on the tiny buttons on our calculators

You drop a rock off a bridge. The rock’s height, h (in feet above the water), after t seconds is modeled by h = -16t^2 + 541. What is the height of the rock after 2 seconds?

Answers

For this case we have the following equation:
 h = -16t ^ 2 + 541
 To answer the question, what we must do is evaluate the function for t = 2.
 We have then:
 h = -16 (2) ^ 2 + 541
 Rewriting we have:
 h = -16 (4) + 541h = -64 + 541h = 477 feet
 Answer:
 The height of the rock after 2 seconds is:
 h = 477 feet

19. You decide to sell your ipod. You initially paid $300 for it. It has been 2 years and each year the value depreciated35%. How much is it worth?

Answers

Answer:

$90

Step-by-step explanation:

300×0.70=210

300-210=90

What is 231 scaled down by a factor of 1/10

Answers

For this case we have the following number:
 231
 We have the following scale factor:
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 Applying the scale factor we have:
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 (231) * (1/10) = 23.1
 Answer:
 The new number is given by:
 23.1

PLS HURRY use the graph to answer the question. Which table of ordered pairs shows a proportional relationship? x 1 12
y 2 6

x 5 12
y 10 6

x 5 8
y 10 4

x 3 5
y 6 10

Answers

Both lines on the graph show proportional relationships. You want to choose the table that has both of its points on the same line. That would be the 4th one:

... x 3 5

... y 6 10

i got the same answer as the other dude but i dont know if i did it the right way. i multiplyed each number opisite from the other so 10 x 3 and 6 x 5 and they both equaled 30 so i guess.?? tell me if i solved this right. probbaly not

Which point represents the intersection of given lines AE and DE

Answers

I am pretty sure it is "E" because both lines AE and De share point e.

Answer:

Hey! the answer is e

Step-by-step explanation:

If you were to draw two lines intercepting each other, one point would be the same, right?

Here there is line AE, and line DE. The repeated point is E, which means it's the intersection.

I can't add visuals at the moment, but imagine like an x, a being on one end, d on the other, and e in the middle.

Hope this helps!
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