Given:
The equation of a circle is
[tex]10y+x^2=-18+5x-y^2[/tex]
To find:
The center and radius of the given equation by completing the square.
Solution:
The standard form of a circle is
[tex](x-h)^2+(y-k)^2=r^2[/tex] ...(i)
where, (h,k) is center and r is radius of the circle.
We have,
[tex]10y+x^2=-18+5x-y^2[/tex]
It can be written as
[tex](x^2-5x)+(y^2+10y)=-18[/tex]
[tex]\left(x^2-5x+\left(\dfrac{5}{2}\right)^2\right)+\left(y^2+10y+\left(\dfrac{10}{2}\right)^2\right)=-18+\left(\dfrac{5}{2}\right)^2+\left(\dfrac{10}{2}\right)^2[/tex]
[tex]\left(x-\dfrac{5}{2}\right)^2+\left(y^2+10y+5^2\right)=-18+\dfrac{25}{4}+5^2[/tex]
[tex]\left(x-\dfrac{5}{2}\right)^2+(y+5)^2=-18+\dfrac{25}{4}+25[/tex]
[tex]\left(x-\dfrac{5}{2}\right)^2+(y+5)^2=\dfrac{-72+25+100}{4}[/tex]
[tex]\left(x-\dfrac{5}{2}\right)^2+(y+5)^2=\dfrac{53}{4}[/tex]
[tex]\left(x-\dfrac{5}{2}\right)^2+(y+5)^2=\left(\dfrac{\sqrt{53}}{2}\right)^2[/tex] ...(ii)
On comparing (i) and (ii), we get
[tex]h=\dfrac{5}{2},k=-5,r=\dfrac{\sqrt{53}}{2}[/tex]
Therefore, the center is [tex]\left(\dfrac{5}{2},-5\right)[/tex] and the radius is [tex]\dfrac{\sqrt{53}}{2}[/tex] units.
The ratio of a to b is 6 to 1. and the ratio of b to c is 12 to 1. What is the value of 2a + 3b / 4b + 3c
A. 3/8
B. 5/17
C. 16/17.
D. 60/17
E. 48/7
Answer:
answer will be 5/17 as I have just substitute the number
The ratio of [tex]a[/tex] to [tex]b[/tex] is [tex]6[/tex] to[tex]1[/tex] and the ratio of [tex]b[/tex] to [tex]c[/tex] is [tex]12[/tex] to [tex]1[/tex], then the value of [tex]\frac{2a + 3b}{4b + 3c}[/tex] is [tex]\frac{180}{51}.[/tex]
What is ratio?Ratio is used to compare to things i.e. numbers, size etc.
We have,
[tex]\frac{a}{b} = \frac{6}{1}[/tex] and [tex]\frac{b}{c} = \frac{12}{1}[/tex]
From the above given data we have to make value [tex]b[/tex] same in both ratios;
Therefore multiply [tex](\frac{a}{b})[/tex] ratios from [tex]12[/tex],
We get,
[tex]\frac{a}{b} = \frac{72}{12}[/tex] and [tex]\frac{b}{c} = \frac{12}{1}[/tex]
So,
[tex]a=72,\\b=12,\\c=1[/tex]
Now, putting above values in [tex]\frac{2a + 3b}{4b + 3c}[/tex],
[tex]=\frac{2(72) + 3(12)}{4(12)+ 3(1)}[/tex]
[tex]=\frac{180}{51}[/tex]
Hence we can say that The ratio of [tex]a[/tex] to [tex]b[/tex] is [tex]6[/tex] to [tex]1[/tex] and the ratio of [tex]b[/tex] to [tex]c[/tex] is [tex]12[/tex] to [tex]1[/tex], then the value of [tex]\frac{2a + 3b}{4b + 3c}[/tex] is [tex]\frac{180}{51}.[/tex]
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A.) 30yd2 B.) 6.5yd2 C.) 13yd2 D.)15yd2
Answer:
D. 15yd^2
Step-by-step explanation:
Area of triangle: A = bh/2
A = 10(3) / 2
A = 30 / 2
A = 15yd^2
Solve for b .
-9 b = 27
please will mark brainliest whoever gets it right
Answer:
b=-3
Step-by-step explanation:
hope this helps!
Solve each system by elimination.
1) 6x - y=-14
-2x + y = 6
Answer:
(-2, 2)
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Algebra I
Solving systems of equations using substitution/eliminationStep-by-step explanation:
Step 1: Define Systems
6x - y = -14
-2x + y = 6
Step 2: Solve for x
Elimination
Combine 2 equations: 4x = -8Divide 4 on both sides: x = -2Step 3: Solve for y
Define equation: -2x + y = 6Substitute in x: -2(-2) + y = 6Multiply: 4 + y = 6Isolate y: y = 2Whoever answers gets brainly
Answer:
The function y = 5 [tex](.98)^{x}[/tex] represents exponential decay
The percentage rate of change is 2%
Step-by-step explanation:
The formula of the exponential growth is y = a [tex](1+r)^{x}[/tex], where
a is the initial valuer is the rate of increase in decimal ⇒ (1 + r) > 1The formula of the exponential decay is y = a [tex](1-r)^{x}[/tex], where
a is the initial valuer is the rate of decrease in decimal ⇒ (1 - r) < 1Let us solve the question.
∵ y = 5 [tex](.98)^{x}[/tex]
→ Compare it with the forms above
∴ a = 5
∵ The rate of change is .98
∵ .98 < 1
→ That means the rate of change is decreasing
∴ The function y = 5 [tex](.98)^{x}[/tex] represents exponential decay
→ From the 2nd form above
∵ (1 - r ) = .98
→ Subtract 1 from both sides
∴ 1 - 1 - r = .98 - 1
∴ - r = - .02
→ Divide both sides by -1
∴ r = .02
→ Multiply it by 100% to change it to a percentage
∵ .02 × 100% = 2%
∴ r = 2%
∴ The percentage rate of change is 2%
a map of Texas uses the scale of 1.5 to represent 60 miles the distance between corpus Christi to Houston is 60 miles what is the distance in inches between the cities on the map
Answer:ahhhh
Step-by-step explanation:
I hope this helps
Which of the following represents the y-intercept of the function y = log (x + 100) - 4 ? *
a. -1
b. -2
c. -3
d. -4
Answer:
b
Step-by-step explanation:
To find the y- intercept, let x = 0 in the equation and solve for y, that is
y = [tex]log_{10}[/tex](0 + 100) - 4
= [tex]log_{10}[/tex] 100 - 4
= 2 - 4
= - 2 ← y- intercept → b
The y-intercept of the function y = log (x + 100) - 4 is -2
What is y-intercept?The y-intercept is the point where the line intersects the y-axis.
Given a function, y = log (x + 100) - 4
Solving for the y- intercept,
Let x = 0 in the equation and solve for y, that is
y = log(0 + 100) - 4
= log100 - 4
= 2 - 4
= -2
Hence, The y-intercept of the function y = log (x + 100) - 4 is -2
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1 3/4 x 1 1/3 give your answer as a mixed number
Answer:
2 1/3
Step-by-step explanation:
1 3/4 is equivalent to 7/4
1 1/3 is equivalent to 4/3
7/ 4 x 4/3
reduce with greatest common factor so the two 4 are out (show a line crossing out the top and bottom 4 )
now you're left with 7 x 1/3 = 7/3
7/3 = 2 1/3
The product of two given mixed fractions is [tex]2\frac{1}{3}[/tex].
The given mixed fractions are [tex]1\frac{3}{4}[/tex] and [tex]1\frac{1}{3}[/tex].
What is the product of two fractions?The product of two fractions is the product of the numerators and the product of the denominators.
Product of two fractions = Product of their denominators / Product of their numerators.
Here, the mixed fraction [tex]1\frac{3}{4}[/tex] can be written as [tex]\frac{7}{4}[/tex] and the mixed fraction [tex]1\frac{1}{3}[/tex] can be written as [tex]\frac{4}{3}[/tex].
Now, 7/4 × 4/3
= 7/3
= [tex]2\frac{1}{3}[/tex]
Therefore, the product of two given mixed fractions is [tex]2\frac{1}{3}[/tex].
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Need answer ASAP. Thanks!
Answer:
The missing angle is about 27.92°.
Step-by-step explanation:
This is a tangent equation, as there is no hypotenuse value. I'll use x as the missing angle.
tan(x) = opposite/adjacent
tan(x) = 20/38
tan(x) = 0.52631578947368421052631578947368
tan(x) ≈ 0.53
Now, we have to reverse.
tan⁻¹(0.53) = x
27.92358972 = x
x ≈ 27.92°
Urgent please help, will give brainliest
in right angle traingle two angle are equal
so.x=y
in triangle
x+y+90=180(sum of interior angle of triangle)
2x=180-90
x=90/3=45°
simplify (4x²y³)(2xy⁶)
Answer:
8x^3y^9
Step-by-step explanation:
just multiply 4 by 2. then, add each exponent. for example, there is x² and there is x, so do x² × x = x³. then do y³ × y^6 = y^9.
If a 6ft baby giraffe casts a 4ft long shadow then how tall is an adult giraffe that casts a 10 ft shadow
What are the values of X and why
2p=
PLZ HELPS IT SAYS
Evaluate the expression for p=5
2p=
Is it 25???
Anyone know the answer??
Answer:
J and I
Step-by-step explanation:
anything els?.... let me know
Ok i NEED HELP (skip number 2)
Answer:
[tex]\frac{8}{9} /12=\frac{2}{27}[/tex]
The GCF of 45 and 60 is 15
The GCF of 20 and 32 is 4
The GCF of 16 and 24 is 8
The graph shown below suggests:
A. a negative correlation.
B. no correlation
C. a weak correlation.
D. a positive correlation.
Answer:
B. no correlation
Step-by-step explanation:
Out of 1800 flags, 36 are purple. What percent of the flags are not purple?
Answer:
2% are purple
Step-by-step explanation:
36/1800 = 0.02 = 2%
Answer:
I think...
its 98% of the flags that are NOT purple
Step-by-step explanation:
36 of 1800 is 2%
PLEASE Find the scale factor that was used
Will give brainliest!!
Check provided photo.
Answer:
1/4
Step-by-step explanation:
Scale factor = 3/12 = 1/4
3, 6, 9, 12
Which number is not like the others? Justify your choice.
Answer:
12
Step-by-step explanation:
12 is a two digit #
Answer:
first of all there are many ways to compare numbers. example
the digit they havethe pattern they havethere amountI don't know how to compare them but I try my best
Step-by-step explanation:
the first 3 numbers have only one digit but the 4th has 2 digits.but it in my opinion you don't want this answer.
so this is not the reason
3 have 2 factor
6 have 4 factor
9 have 3 factor
12 have 5 factors
so as the number increase the factors should increase but 9 has less factors than 6 .so I think 9 is the different one
Five girls are sitting in a row. Ruhi is sitting on the extreme left & adjacent to Khushi. Tina and Khushi are not sitting together. Sinu and Pihu are sitting Togther but Sinu is
not sitting next to Tina. Who are sitting at extreme ends of the row
A. Khushi and Pihu
B. Ruhi and Tina
C. Ruhi and Sinu
D. Pihu and Tina
The expression 200 - 16t2 models the height in feet of an object that falls from the initial height of 200 feet t seconds after being dropped. Find the height of the object after 0.75 seconds. Make sure and include the units of feet in your answer for full credit. Round your answer to the nearest hundredth place.
Answer:
Concept: Modeling expressions
We are given the equation [tex]200 - 16 {t}^{2} [/tex]We want to find the time after 0.75 seconds given that t is represented in seconds.Hence we do [tex]200 - 16(0.75)^{2} [/tex]Hence we get the answer to 191 feetThe height of the object that falls after 0.75 seconds given that t is represented in seconds is 191 feet.
What is a quadratic equation?A quadratic equation is the second-order degree algebraic expression in a variable. the standard form of this expression is ax² + bx + c = 0 where a. b are coefficients and x is the variable and c is a constant.
The expression 200 - 16t^2 models the height in feet of an object that falls from the initial height of 200 feet t seconds after being dropped.
We need to find the time after 0.75 seconds given that t is represented in seconds.
The expression is given
[tex]200 - 16t^2[/tex]
time t = 0.75
Substitute the value of t in the given expression
= 200 - 16(0.75)^2
= 200 - 9
= 191
Hence we get the answer to 191 feet.
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Carmen reads 2/3 chapters in 7/8 hours. What is the unit rate in chapters per hour?
Write your answer in simplest form.
Answer:
16/21
Step-by-step explanation:
Divide both sides by 7 to get 1/8
2/3 = 7/8
1/7 x 2/3 = 7/8 x 1/7
2/21 = 1/8
Then multiply both sides by 8 to get 8/8 which is 1
8/1 x 2/21 = 1/8 x 8/1
16/21 = 1
Please help me with this math question asap. I will mark brainliest Thank you so much! Question 4/5
Answer:
So... This is it
1. JK = LM, JKM = LMK -> This is given information.
- From this given information, we know:
1. 2 congruent sides
2. 2 congruent angles
Now all we have to do is find one more side to prove SAS triangle congruence.
Next, we notice that the side MK is used by both the triangles we are trying to prove congruent. So we can say "MK = MK" by the reflexive property. (Since they share the same side).
Then, we can say triangle JMK is = triangle LKM because of SAS congruence.
*Please note the = signs I used should be actually congruence signs*
Use the Law of Sines to find the value of ZA.
С
25
28
62°
B
А
$12.99 sweater, 7% tax
Answer the question in the image below
Answer:
ans of an 1 is option b
Step-by-step explanation:
because x and y both are +ve
Which of these brands have the lowest cost per unit? PLEASE HELP MY FIRST MATH GRADE OF THE QUARTER IS ON THE LINE!
Answer:
you need a dotted point starting at 3 and going to to the right
Step-by-step explanation:
the dotted point means x < , x > and since it is greater you always go to the right
Plz help me I need tu turn this is by midnight!!
Answer:
The last answer.
Step-by-step explanation:
It looks to be the correct answer because for the one above you can't simplify 27 by 5.
I NEED ANSWER QUICK. Will give brainliest
Answer:
A
Step-by-step explanation:
Both of them Equal 4