Answers
Answer:
As follows,
Step-by-step explanation:
You can solve these either by factoring or using the quadratic formula or other ways,
1. x^2+2x+1=0
Factoring,
(x+1)^2=0
x+1=0
x=-1
2.y^2-y-2=0
Using quadratic formula,
(-b±√(b^2-4ac))/2a
(--1±√(-1^2-4*1*-2))/2*1
(1±√(1+8))/2
(1±√(9))/2
(1±3)/2
y=(1±3)/2
y=(1+3)/2 y=(1-3)/2
y=4/2 y=-2/2
y=2 y=-1
3.y^2+y+1=0
Using quadratic formula,
(-b±√(b^2-4ac))/2a
(-1±√(1^2-4*1*1))/2*1
(-1±√(1-4))/2
(-1±√(3))/2
No real roots
4. x^2+9x+18=0
Using quadratic formula,
(-9±√(9^2-4*1*18))/2*1
(-9±√(81-72))/2
(-9±√(9))/2
(-9±3)/2
x=(-9+3)/2 x= (-9-3)/2
x=-6/2 x=-12/2
x=-3 x=-6
5.x^2+5x+6=0
Using quadratic formula,
(-5±√(b^2-4ac))/2a
(-5±√(5^2-4*1*6))/2*1
(-5±√(25-24)/2
(-5±1)/2
x=(-5+1)/2 x=(-5-1)/2
x=-4/2 x=-6/2
x=-2 x=-3
6. 3n^2-13n-10=0
Using quadratic formula,
(-b±√(b^2-4ac))/2a
(-(-13)±√(-13^2-4*3*(-10)))/2*3
(13±√(169-(-120))/6
(13±√289)/6
The discriminant b^2−4ac>0
So there are 2 real roots.
x=(13±17)/6
x=30/6 or x=-4/6
x=5 or x=-2/3
Related Questions
71 degrees Determine the value of x.
A) 109 degrees
B) 71 degrees
C) 142 degrees
D) 35.5 degrees
Answers
Answer:
A) 109 degrees
The answer is 109 degrees because each opposite angle added equals 180°. 180-71= 109
Good luck on your assignment ⊂(◉‿◉)つ
will give branliest to right answer
Answers
Answer:
i think it is b
Step-by-step explanation:
Because I genuinely think it is
70 percent of 38.20 is what
Answers
Answer:
26.74
Step-by-step explanation:
38.20 x 0.70
= 26.74
7. Write 1.07 x 103 in standard form.
Answers
Answer:
if its 1.07 x 10^3 its 10,70
Step-by-step explanation:
A notice of use and disclosure is required for a) patients whose personal health information the doctor intends to disclose. b) every patient a doctor treats. c) patients treated for sensitive conditions, such as substance abuse or mental illness. new patients, but not established patients.
heelp me pls pls
Answers
Answer:
b
Step-by-step explanation:
5 5/8 divided by 1 1/2
Answers
Answer:
15/4
Step-by-step explanation:
Answer:
3 3/4
Step-by-step explanation:
cause its easy
a little mermaid can't swim 12 miles downstream in the same amount of time she can swim 8 miles upstream. What is the little mermaid speed's in still water if the speed of the current is 4mph
Answers
A little mermaid can't swim 12 miles downstream in the same amount of time she can swim 8 miles upstream. The little mermaid speed's in still water is: 4/5 mile per hour.
The distance of the miles can be estimated by using the formula:
distance = speed rate × time
∴
[tex]\mathbf{time = \dfrac{distance}{ rate}}[/tex]
Let the current speed be = x
In the upstream direction;
the rate = swim speed - the current speed = 4 - xin the downstream direction;
the rate = 4 + x∴
[tex]\mathbf{t = \dfrac{8}{4 -x}= \dfrac{12}{4+x}}[/tex]
By cross multiply;
8 (4 + x) = 12 (4 - x)
32 + 8x = 48 - 12x
8x + 12x = 48 - 32
20x = 16
x = 16/20
x = 4/5 mile per hour
Therefore, we can conclude that the little mermaid speed's in still water is 4/5 miles per hour.
Learn more about speed here:
https://brainly.com/question/22610586?referrer=searchResults
What is 99x99 - 8x8 + 25+
Answers
Answer:
9762
Step-by-step explanation:
help pls asap math problem
Answers
Answer:
PHOTO MATH KANALANG
Step-by-step explanation:
BAKA MERON ANS DON
If RS = x + 2 and ST = 2x, what is ST?
Answers
Answer:
ST = 2x
Step-by-step explanation:
if not please elaborate on the question.
HELP US PLS I WILL GIVE BRAINLIEST!!!!!
Answers
Is the question asking what you should if so the answer is unit rate because a unit rate means a rate of one to something while a rate is a ratio which the two terms are in different units. Since it is divided the most it can it is a unit rate
help please this is kinda difficult .
Answers
im pretty sure that the slope for both lines would be 2
Hey ! Can anyone help me with this problem please thank you !!
Answers
Answer:
2
Step-by-step explanation:
7x + 3 = 8x + 1
2 = x
these are geometry problems.
Worth 35 points and Ill give brainliest to corrects answer Please help!
1. Which statement best represents how structure relates to function?
A. The average dog can learn approximately
B. Oppsable thumbs in humans and certain other animales for fine control of gripled objects.
C. Fruit flies live for only 40 to 50 days. D. Robins build nests in trees.
2. who is studying a newly discovered animal, a scientist observes that the animal chance to have one or two Offspring at a time only once or twice per year.
Which type of life history does this animale use?
A. R-Strategy
B. K-Strategy
C. Logistic growth
D. Asexual reproduction
Answers
Answer:
The
Answer
for
1
might
be
B
and
answer
for
number
2
is
c
I
think
Pa help pleas ineed po
Answers
Answer:
As shown in the attachment,
Step-by-step explanation:
refer to the attachment
What are 7 interesting facts or stories about Martin Luther king JR please answer
Answers
Answer:
I already answered it for you
Find the exact value of sin
Answers
So
First find the Cos of the values using a triangle and the Pythagorean theorem
Triangle X missing side =Sqrt(5^2 - 4^2) = 3
Triangle y missing side = sqrt(13^2 - 12^2) = 5
So we now plug it into the equation
(4/5)(5/13) - (3/5)(12/13)
Multiply
4/13 - 36/65 = -16/65
What is the sum of the first 50 terms in the sequence 4,-4,4,-4,4...?
Answers
Answer:
0
Step-by-step explanation:
If there is an even number of 4 and -4s. They should all cancel each other out and equal 0.
In ΔFGH, g = 39 cm, h = 54 cm and ∠F=34°. Find the area of ΔFGH, to the nearest square centimeter.
Answers
Answer:
≈ 589 cm²
Step-by-step explanation:
area = 1/2 * 39 * 54 * sin34°
= 1/2 * 39 * 54 * 0.559194
= 588.83
≈ 589
What is the solution of |2x+5|<19?
Answers
Answer:
[tex]2x + 5 < 19 \\ 2x < 19 - 5 \\ 2x < 14 \\ x < 7[/tex]
Answer:
The result can be shown in multiple forms.
Inequality Form:
−12< x < 7
Interval Notation:
(−12,7)
Step-by-step explanation:
first write |2x+5|<19 as a piece wise
2x+5≥0
To find the interval for the first piece, find where the inside of the absolute value is non-negative.
[tex]\frac{2x}{2}[/tex] ≥[tex]\frac{5}{2}[/tex] divide
x ≥−[tex]\frac{5}{2}[/tex] cancel common factor of 2
x ≥ −5/2.
To find the interval for the second piece, find where the inside of the absolute value is negative.
2x+5 < 0
substract by 5
2x < −5
divide by 2x
2x/2< −5/2
simplify to left side
x < −5 / 2
Simplify the right side.
x < −5/2
In the piece where 2x+5 is negative, remove the absolute value and multiply by −1
− (2x+5) < 19
Write as a piecewise.
{2x+5 <19 x ≥ − 5/2
− (2x+5) < 19 x <− 5/2
Simplify −(2x+5)<19.
{2x+5<19 x≥−5/2
−2x−5<19 x<−5/2
Solve 2x+5 < 19 when x ≥ −5/2.
2x+5<19 for x.
Move all terms not containing x to the right side of the inequality.
2x < 14
divide by 2
x < 7
Find the intersection of x < 7 and x ≥−5/2.
−5/2 ≤x <7
Solve −2x−5 <19 when x <−5/2.
Move all terms not containing x to the right side of the inequality.
−2x<24
divide by -2
x>−12
Find the intersection of x > −12 and x <−5/2.
Find the union of the solutions.
−12 < x < 7
It is claimed that 79% of all Americans live in cities with population greater than 100,000 people.
Based on this, if 41 Americans are randomly selected, find the probability that
a. Exactly 30 of them live in cities with population greater than 100,000 people.
b. At most 33 of them live in cities with population greater than 100,000 people.
c. At least 34 of them live in cities with population greater than 100,000 people.
d. Between 28 and 33 (including 28 and 33) of them live in cities with population greater than
100,000 people.
Answers
Last quarter Rachel earned a grade of 92. This quarter she earned an 88. What is the percent decrease in her grade?
Answers
Answer:
[tex]$4.\overline{54}[/tex]
Step-by-step explanation:
The percent decrease is [tex]$92/88-1=23/22-1=1/22=4.5454545...$[/tex].
So, the answer is [tex]$\boxed{4.\overline{54}}$[/tex] percent decrease.
please give clear answer!! soon <3
Explain how you can take an imaginary number and multiply it by another imaginary
number and get a real number.
Answers
Answer:
When you multiply two imaginary numbers, you are essentially multiplying them by itself or squaring them. If we recall, an imaginary number is the square root of -1. By squaring this number, you're eliminating the square root, ending up with -1 (aka a real number).
Explain how you can use doubles when
multiplying with 4 to find 4 X 8.
Answers
Multiplying by 4 using the doubles strategy utilizes the fact that 4 is double of 2. Hence, 4 time any number is double of 2 times that number. Thus, given 4 x 8, it can be evaluated using the double strategy as follows 2 x 8 + 2 x 8 = 16 + 16 = 32
6. The cost to download a normal movie is $15.00. New released movies
cost $18.00 to download. What is the percent of increase from a normal
movie download and the new releases?
Answers
Answer:
+20% increase
Step-by-step explanation:
(V2−V1)/|V1|×100
=(18−15)|15|×100
=315×100
=0.2×100
=20%change
=+20%increase
the percent of increase from a normal movie download and the new releases are $3.00
When reading a data set in ascending order (from smallest value to largest value), which of the following is the correct order of values that you would observe:
20th percentile, 1st quartile, 4th decile, median
30th percentile, median, third quartile, 6th decile
2nd decile, median, 1st quartile, 70th percentile
10th percentile, third quartile, median, 8th decile
Answers
Answer:
el equivalente a 23.79 no daré explicación
17 percent of what is 40
45 of 155 is what
What percent of 153 is 137
Answers
Answer:
Number 1 :If you are using a calculator, simply enter 40×100÷17, which will give you the answer.
Number 2: 45 percent of 155 is 69.75.
Number 3: 137 is what percent of 153? = 89.54
17% of 235.29 is 40
45% of 155 is 69.75
136 is 89.54% of 153
Solve 2^2 + x - 4 = 0.
Answers
Answer:
x=0
Step-by-step explanation:
2^2 + x - 4 = 0
2^2 = 4
4+x-4 = 0
Combine like terms
x=0
(w2x−3)÷10⋅z when w=−9, x = 2.7, and z=−2/5
Answers
[tex]\\ \sf\longmapsto \dfrac{w^2x-3}{10z}[/tex]
[tex]\\ \sf\longmapsto \dfrac{(-9)^2(2.7)-3}{10(-2/5)}[/tex]
[tex]\\ \sf\longmapsto \dfrac{81(2.7)-3}{-2(2)}[/tex]
[tex]\\ \sf\longmapsto \dfrac{218.7-3}{-4}[/tex]
[tex]\\ \sf\longmapsto \dfrac{215.7}{-4}[/tex]
Rounding up numerator[tex]\\ \sf\longmapsto \dfrac{216}{-4}[/tex]
[tex]\\ \sf\longmapsto -44[/tex]
Step-by-step explanation:
(-9)^2(2.7)-3/10(-2/5
= 81(2.7)-3/-2(2)
= 218.7-3/-4
= 215.7/-4
= -44
Find the value of x.........
Answers
Answer:
Would x not be 70 degrees as it corresponds to the 70 on the bottom line?
Step-by-step explanation: