For this case we have a quadratic equation of the form:
ax² + bx + c = 0
Rewriting the equation we have:
3k² -4k - 7 = 0
So we have to:
a = 3
b = -4
c = -7
The solutions will come from:
k = -b±√b²-4(a)(c)/2(a)
Thus, the value of "b" is -4
Answer:
b = -4
Answer: -4
Step-by-step explanation:
i took the quiz its -4
If a polyhedron has 11 faces and 18 edges, how many vertices does it have?
Use Euler's formula for polyhedra: V - E + F = 2
vertices - edges + faces = 2
So edges = vertices + faces - 2 = 18 + 11 - 2 = 27.
Answer:
27 edges.
Help plsss! I don’t get this
help please
Make up two equations, one that is true and one that is false. State which equation is true and which is false.
Answer:
57+20= 90 (false)
40+39= 79 (true)
Answer:
14 * 9(-9) - 8 = 1142 9 - 45(-3) + 7 = 151
Step-by-step explanation:
14 * 9(-9) - 8 = 1142 9 - 45(-3) + 7 = 151
(This one is true) (This one is false)
Beth simplified the expression 8 + 10 + 8 + 2 minus (4 times 1.4) minus (4 times 1.4) to find the perimeter of the figure on the grid.
On a coordinate plane, a figure has side lengths of 8, 10, 8, 2, (4 times 1.4), (4 times 1.4).
What error did Beth make?
She found the area of the figure instead of the perimeter.
She subtracted the lengths of the diagonal lines instead of adding them.
She used 4 times 1.4 to represent the length of each diagonal line instead of 4.
She added the horizontal and vertical lengths instead of multiplying them.
Answer:
Step-by-step explanation:
the answer is 16.8
Explanation: well for starters you have to do what's in the parenthesis, so 4 times 1.4 is equal to 5.6. so now we add up the equation and get 28, so now we are left with 28-5.6-5.6 which equals 16.8
hoped this helped;)
Answer:
She subtracted the lengths of the diagonal lines instead of adding them.
Step-by-step explanation:
How many dots are in the 5th step?
Answer:
add 5 + 4, which is 9 and that's 81 dots
Can someone please help as I'm not sure how to tackle this step by step? Especially question b, d, g, j, k, l. Not how sure to do it if contains a surd just on its own.
Step-by-step explanation:
√a = 1√a so we can solve them easily:
b) 3√7 -√7= 3√7 - 1√7 =( 3-1)√7= 2√7
d) 5√6 - 2√6+√6= (5-2+1)√6 = 4√6
g) √2+2√2= 3√2
j) √5+5√5 - 3√5 = 3√5
k) 2√3 + √3 - 5√3= -2√3
I) 5√11 + 7√11 - √11 = 11√11
Please help!!! Me 20 points
Answer:
shade 20 squares
Step-by-step explanation:
What your going to think about is there is going to be 4 5's so 4 x 5 is 20
Answer:
I saw the other persons work and I also believe the answer is 20.
Step-by-step explanation:
By multiplying the dividend from the graph.
PLEASE HELP ITS MATH THANK YOUUUU
There are tulips, daisies, and daffodils growing in a garden. There are 2 times as
many daisies as tulips and 3 times as many daffodils as tulips. If there are 12
daisies, how many total flowers are in the garden?
The percent of change from 200 to 220 and indicate if it is an increase or decrease.
Answer: Increase
Step-by-step explanation:
It was -12 degrees Fahrenheit last night. The weatherman predicts that it will be 25 degrees warmer by noon. What will the temperature be by noon?
Answer:
-12 + 25 = 13 degrees
Step-by-step explanation:
Since it was -12 degrees you have to add the 25 degrees since it would be warmer.
Answer:
13 degrees Fahrenheit
Step-by-step explanation:
Evaluate (625) power of 0.16 × (625) power of 0.09
Answer:
5Step-by-step explanation:
(625) power of 0.16 × (625) power of 0.09
[tex]625^{0.16}\times625^{0.09}=625^{0.16+0.09}=625^{0.25}=(5^4)^{0.25}=5^{4*0.25}=5^1=5[/tex]2) The management company of a popular, but unstable, rapper is worried about their investment
in his up-coming world tour, so they purchase a 1-year $1 million insurance policy for $137,000.
The probability the rapper will successfully complete the 1-year world tour is 0.87352. What is
the expected value of the policy from the perspective of the management company?
Answer:
137,000
Step-by-step explanation:
its math bro
please help need this done by tomorrow thank you [PHOTO]
Answer:
31
Step-by-step explanation:
sum of the bordering angles is 180° so
(5x-16) + (x+10) = 180
5x - 16 + x + 10 = 180
6x - 6 = 180
6x = 186
x = 186 ÷ 6
x = 31
Answer:
The answer is x=31.
5x-16+x+10=180
6x-6=180
6x=186
x=31
Then, 5(31)-16=
155-16= 139
Also, x+10=
31+10=41
Solution check:
139+41=180, so x=31 is correct.
17. Bailey rode Coaster B four times. How
many feet did she ride? What is your
answer rounded to the nearest thousand?
DATA
18. Janna rode each of the four roller
coasters listed in the table twice. How
many feet of roller coaster did she ride?
Answer:
Step-by-step explanation:
The speed of object A is 1,500 mph faster than that of object B. If
object B travels 3,500 miles in the same amount of time that object A
travels 85,000 miles, then find the speed of object A.
Answer:
1564.42 mph
Step-by-step explanation:
Let a = Object A's speed
b = Object B's speed
a = b + 1500
a/85000 = b/3500
Let's make subtract 1500 from both sides of the first equation
a = b + 1500
- 1500 - 1500
b = a - 1500
Cross multiply the second equation
3500a = 85000b
Plug in the new b into this new equation
3500a = 85000(a - 1500)
3500a = 85000a - 127500000
Subtract 3500a and 127500000 from both sides
3500a = 85000a - 127500000
- 3500a - 3500a
0 = 81500a - 127500000
+ 127500000 + 127500000
127500000 = 81500a
Divide both sides by 81500
127500000/81500 = 81500a/81500
a = 1564.4171779141104
542+876-65+76×5444+556-77
Answer:
=415576
Step-by-step explanation:
=1418−65+(76)(5444)+556−77
=1353+(76)(5444)+556−77
=1353+413744+556−77
=415097+556−77
=415653−77
Solve for x. round to the nearest tenth. 9 24
Answer:
x ≈ 3.7Step-by-step explanation:
Use trigonometry:
sine = opposite / hypotenusesin 24 = x/ 9x = 9 sin 24x ≈ 3.7What’s three-and-two-fifths times three-and-one-fourth?
Answer:
Answer is 221/20
Step-by-step explanation:
if we solve 3 2/5 × 3 1/4
then we will get 221/20.
Pls need help, will give brianlist
Answer:
1) Your slope should be 1/5
2) Your slope should be [tex]\frac{-3}{2}[/tex]
3) Your slope should be 1/2
I hope this helps! : )
10.com
Leg, width
and height
Answer:
volume = length × breadth × height
v = l × b × h
= 6 × 7 × 10
= 420 cm³
so the volume of the cubeoid is 420 cm³
Step-by-step explanation:
brainliest plz
Please help!! 30 POINTS
Show your work
NO RANDOM LINKS
9514 1404 393
Answer:
x^2 -x +3
Step-by-step explanation:
The long division is shown in the attachment, along with details of how the quotient terms are found.
[tex]\dfrac{x^3-5x^2+7x-12}{x-4}=\boxed{x^2-x+3}[/tex]
Given the vectors ⃗⃗ = 〈2, 3, 5〉, ⃗ = 〈−2, 5, 0〉, ⃗⃗ = 〈−3, 2, 7〉 calculate:
a) ⃗⃗ + ⃗ + ⃗⃗
Answer:
a
Step-by-step explanation:
Solve algebraically for x 3600 + 1.02x < 2000 + 1.04 x
Answer:
x>80000
Step-by-step explanation:
3600+1.02x<2000+1.04x=x>80000
find the value of 5x³+x²-2x, if X=2
Answer:
5(2)^3 + (2)^2 - 2(2)
5(8) + 4 - 4
=40
Step-by-step explanation:
Since X = 2, you'll put 2 in the place of x, that means anywhere you find an X, you'll replace it with an X.
1/4 + 23/28 - 1
please help
Answer:
[tex]\frac{1}{14}[/tex]
Step-by-step explanation:
[tex]\frac{1}{4} + \frac{23}{28} - 1 = ?[/tex]
First off, let's change everything to a common denominator. This will allow us to add the fractions!
To find a common denominator, we find a number that both 4, 28, and 1 can go into. 28 is the best choice, as 4 goes into it 7 times, 28 goes into it once, and 1 goes into it 28 times.
Let's change the first fraction into a number with a denominator of 28!
[tex]\frac{1}{4} * \frac{7}{7} = \frac{7}{28}[/tex]
[tex]\frac{7}{7}[/tex] = 1. Multiplying a number by one doesn't change its value.
The second fraction, [tex]\frac{23}{28}[/tex], already has a denominator of 28, so we don't have to do anything with it.
Now to the third number, -1:
[tex]-1 = -\frac{1}{1} * \frac{28}{28} = -\frac{28}{28}[/tex]
Now, let's add them all up!
[tex]\frac{7}{28} + \frac{23}{28} - \frac{28}{28} = \frac{7 + 23 - 28}{28} = \frac{2}{28}[/tex]
One last step, to simplify:
[tex]\frac{2}{28} = \frac{1}{14}[/tex]
Your answer is 1/14!what is the value of x when y is 31
Answer:
16
Step-by-step explanation:
Answer:
16
Step-by-step explanation:
Direct variation
y = kx
16 = k*8
Divide each side by 8
16/8 = 8k/8
2 = k
The equation is y =2x
y =2x
Let y =32
32 = 2x
Divide by 2
32/2 = x
16 =x
Which of these statements is true?
Answer:
3rd one
because they r right angles and congruent to each other and for right angle its is used HS postulate
Given matrices A and B shown below, find (3)A+(8)B.
Answer:
[tex]\left[\begin{array}{ccc}32&-55\\3&39\end{array}\right][/tex]
Step-by-step explanation:
[tex]\left[\begin{array}{ccc}0&-15\\3&15\end{array}\right] +\left[\begin{array}{ccc}32&-40\\0&24\end{array}\right] =\left[\begin{array}{ccc}0+32&-15+(-40)\\3+0&15+24\end{array}\right] = \left[\begin{array}{ccc}32&-55\\3&39\end{array}\right][/tex]
Help with questions 21-23 using pemdas
If u can, please help with some ones below those (using pemdas) :]
Tyyy
Answer:
21. 123 22. 6.86 or 6/ 6/7 23. 90
Step-by-step explanation:
21. (6+4)² + (22+10÷2)
(10)² + (22 + 5)
100 + 27
127
22. (11+42-5) ÷ (11-4)
48 ÷ 7
6.85 or 6 6/7
23. (17-3) × (14 - 6) -22
14 × 8 - 22
112 - 22
90