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3 years ago

How do you figure out if the parabola is to the side or upward/downward?

1 answer:

7 0

Patterns: vertical : y = a(x - h)² + k horizontal: x = a(y - k)² + h

Look at the patterns above and remember these key points.

1) if the x is squared, the parabola is vertical. It either opens up or down.
if the y is squared, the parabola is horizontal. It either opens left or right.

2) if a is positive, the parabola opens up or to the right.
if a is negative, the parabola opens down or to the left

3) the vertex is at (h,k). Be very careful. locations of h and k varies if the parabola is vertical or horizontal. its sign is also different in those positions

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What is bigger, 3/4 or 2/3

valentina_108 [34]

If you split a circle in to 4, and color in 3 of the 4 pieces you will find that 3/4 are bigger than 2/3

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3 years ago

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The bill for a stay in a hotel was $188 including $15 tax. what percent of the bill was the tax?

ziro4ka [17]

$\frac{15}{188}\cdot100\%=\\\\\frac{1500}{188}\%\approx8\%\\\\The\ tax\ was\ about\ 8\%\ of \ bill.$

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2 years ago

Factor the expression below 36a2-25b2 which binomial is factor of the expression

Serhud [2]

Answer: (6a + 5b) • (6a - 5b)

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "b2" was replaced by "b^2". 1 more similar replacement(s).

Step by step solution :

Step 1 :

Equation at the end of step 1 :

(36 • (a2)) - 52b2

Step 2 :

Equation at the end of step 2 :

(22•32a2) - 52b2

Step 3 :

Trying to factor as a Difference of Squares :

3.1 Factoring: 36a2-25b2

Theory : A difference of two perfect squares, A2 - B2 can be factored into (A+B) • (A-B)

Proof : (A+B) • (A-B) =

A2 - AB + BA - B2 =

A2 - AB + AB - B2 =

A2 - B2

Note : AB = BA is the commutative property of multiplication.

Note : - AB + AB equals zero and is therefore eliminated from the expression.

Check : 36 is the square of 6

Check : 25 is the square of 5

Check : a2 is the square of a1

Check : b2 is the square of b1

Factorization is : (6a + 5b) • (6a - 5b)

Final result :

(6a + 5b) • (6a - 5b)

brainly would epic!

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3 years ago

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What’s the answer to this math problem?v

Ann [662]

It’s A or D but I have a strong feelin it’s A

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3 years ago

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(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