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2 years ago

What is the distance between points L(-1,3) and 2(4, -9) HELP ASAP

Mathematics

2 answers:

sleet_krkn [62]2 years ago

6 0

Step-by-step explanation:

the other answer is correct.

just a few words about the why :

when you look at 2 points on the coordinate grid, then the distance between them creates a right-angled triangle.

the direct distance is the Hypotenuse (the baseline opposite of the 90° angle).

and the x-coordinate difference and the y-coordinate difference are the legs of that triangle.

and then we can use Pythagoras

c² = a² + b²

c = sqrt(a² + b²)

with c being the Hypotenuse.

and you see, that is exactly the so-called distance formula the other answer used.

Reika [66]2 years ago

5 0

Answer:

13 units

Step-by-step explanation:

calculate the distance d using the distance formula

d = $\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 }$

with (x₁, y₁ ) = (- 1, 3 ) and (x₂, y₂ ) = (4, - 9 )

d = $\sqrt{(4-(-1))^2+(-9-3)^2}$

= $\sqrt{(4+1)^2+(-12)^2}$

= $\sqrt{5^2+144}$

= $\sqrt{25+144}$

= $\sqrt{169}$

= 13

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What is the answer to 1/4 - (-1/6)

Aloiza [94]

Answer:

5/12

Step-by-step explanation:

1/4 + 1/6 = (6+4)/24 = 10/24 = 5/12

why +1/6?

because: - (-) = +

4 0

3 years ago

Prove that the gregorian calendar repeats itself every 400 years.

Setler79 [48]

The calendar obviously has an integral number of years and months in 400 years. If it has an integral number of weeks, then it will repeat itself after that time. The rules of the calendar eliminate a leap year in 3 out of the four century years, so there are 97 leap years in 400 years. The number of excess days of the week in 400 years can be found by ...

(303·365) mod 7 + (97·366) mod 7 = (2·1 + 6·2) mod 7 = 14 mod 7 = 0

Thus, there are also an integral number of weeks in 400 years.

The first day of the week is the same at the start of every 400-year interval, so the calendar repeats every 400 years.

3 0

3 years ago

A drop of oil makes a circular ring in a water puddle. The radius of the oil ring expands at 1.5 cm per second. If r(t)=1.5t and

Readme [11.4K]

Answer:

$a(t) =n(0.25t^2)$

Step-by-step explanation:

Given

$r(t) = 0.5t$

$a(r) = nr^2$

Required

Determine the area in terms of time

From the question, we have:

$r(t) = 0.5t$ -> radius per time

and

$a(r) = nr^2$ --> area from radius

The interpretation of the question is to find the composite function: a(t)

If $a(r) = nr^2$ , and $r(t) = 0.5t$ , the

Substitute 0.5t for r

$a(t) =n(0.5t)^2$

$a(t) =n*0.25t^2$

$a(t) =n(0.25t^2)$

5 0

3 years ago

(a) Find the three-digit number that increases by 30% when each of its

Elden [556K]

Step-by-step explanation:

So a three digit number can be expressed as: $100a + 10b + c$ where a is the third digit, b is the second digit, and c is the first digit. Or in other words a is the hundreds place, b is the tens place, and c is the ones place. When something "increases" by 30%, it is 130% it's original value, and to calculate how much that is, you simply convert 130% to a decimal by dividing by 100, which gives you 1.30. And since all the digits are increased by 1, you have the equation:

$100(a+1) + 10(b+1) + 1(c+1) = 1.30(100a+10b+c)$

Distribute the multiplication on the left side:

$100a+100+10b+10+c+1=1.30(100a+10b+c)$

Distribute the multiplication on the right side:

$100a+100+10b+10+c+1=130a+13b+1.3c$

Add like terms on the left side:

$100a+10b+c+111=130a+13b+1.3c$

Subtract 100a, 10b, and c from both sides

$111=30a+3b+0.3c$

So "technically" you can just plug in any two values, and then solve for the last value, but since you have a 3 digit number, you have the restriction of a < 10, b < 10, and c < 10, and also a, b, and c, should only be integers and all have the same sign or it wouldn't be a 3 digit number.

So let's start with a, since it has the highest coefficient, well you can fit 30 into 111, 3 times without going over so that's the first value

111 = 30(3) + 3b + 0.3c

111 = 90 + 3b + 0.3c

Now subtract the 90 from both sides

21=3b+0.3c

Well 3 can fit into 21, 7 times!

21 = 3(7) + 0.3c

21 = 21 + 0.3c

subtract 21 from both sides

0 = 0.3c

and now obviously c is 0, if you want you can divide both sides by 0.3 but it's a bit redundant

c = 0

This gives you the three values, a=3, b=7, c=0. which is the number 370. Now let's double check. Adding 1 to each digit would give you 481 and 481/370 = 1.3, so it is correct!

part b:

So to prove there is no three digit number, is to realize there is no solution, given the restriction or integers, greater than or equal to 0, and less than 10, and all of them must have the same sign.

So let's start with the same equation except this time instead of 1.3 it's 1.4

$100(a+1) + 10(b+1) + 1(c+1) = 1.40(100a+10b+c)$

Distribute on the left side;

$100a+100+10b+10+c+1=1.40(100a+10b+c)$

Distribute on the right side:

$100a+100+10b+10+c+1=140a + 14b + 1.4c$

Add like terms on left side:

$100a + 10b + c + 111 = 140a + 14b + 1.4c$

Subtract 100a, 10b, and c from both sides:

$111 = 40a + 4b + 0.4c$

Now to do the same process, let's start by finding how many times we can fit 40 into 111, and if you're wondering why we start with 40, it's because let's say for example I just say, I can fit another 40 into it, but I decide not to, and let b do that, well even if it's just 40, b will have be at least 10, which does not fit our restrictions, so you have to fit as many 40's into the number first then go the other numbers.

So only 2 40's can fit in 111 without going over the value

111 = 40(2) + 4b + 0.4c

Subtract 80 from both sides

$31=4b+0.4c$

4 can fit into 31, 7 times

31 = 4(7) + 0.4c

31 = 28 + 0.4c

subtract 28 from both sides

3 = 0.4c

divide both sides by 0.4

7.5 = c.

Since c is not an integer there is no 3 digit number that exists that increases by 40% whenever you increase it by 1.

7 0

2 years ago

(4x2 + 7x - 4) + (x2 - 7x + 14)

fomenos

Answer:

4+7x

Step-by-step explanation:

5 0

3 years ago