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gogolik [260]
3 years ago
6

What is (3x-4) (7x+4)

Mathematics
2 answers:
d1i1m1o1n [39]3 years ago
7 0

Answer:21x^2-16x-16

Step-by-step explanation:

(3x)(7x)+(3x)(4)+(−4)(7x)+(−4)(4) =

21x^2+12x−28x−16

21x^2−16x−16

enot [183]3 years ago
6 0

Answer:

21x^2 -16x -16

Step-by-step explanation:

This is a basic multiplication question,

We all know that (a+b)(c+d)=ac+ad+bc+bd

Here,

a = 3x

b = -4

c = 7x

d = 4

Therefore,

3x*7x + 3x*4 + (-4)*7x + (-4)*4

=> 21x^2 +12x - 28x -16

=> 21x^2 -16x -16

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Flight 202's arrival time is normally distributed with a mean arrival time of 6:30 p.m. and a standard deviation of 15 minutes.
natta225 [31]

Answer:

The probability is 0.0015

Step-by-step explanation:

We know that the mean \mu is:

\mu=6:30\ p.m

The standard deviation \sigma is:

\sigma=0:15\ minutes

The Z-score is:

Z=\frac{x-\mu}{\sigma}

We seek to find

P(x>7:15\ p.m.)

The Z-score is:

Z=\frac{x-\mu}{\sigma}

Z=\frac{7:15-6:30}{0:15}

Z=\frac{0:45}{0:15}

Z=3

The score of Z = 3 means that 7:15 p.m. is 3 standard deviations from the mean. Then by the rule of the 8 parts of the normal curve, the area that satisfies the conficion of 3 deviations from the mean has percentage of 0.15%

So

P(x>7:15\ p.m.)=P(Z>3)=0.0015

3 0
3 years ago
Cat este 5 la puterea 5?
8090 [49]
5^5=5*5*5*5*5=25*25*5=625*5=3125
5 0
3 years ago
Which statement is TRUE? A) The area of the blue circle is greater than the sum of the areas of the green square and black circl
statuscvo [17]

Answer:

C. The area of the blue circle is equal to the sum of areas of green square and black circle.

Step-by-step explanation:

The area of a circle is the circumference of the circle measured with its diameter. In the given scenario the area of the blue circle is greater than the area of black circle. This is because of the difference in diameter of the two circles. The area of green square plus the area of black circle equals the blue circle.

6 0
3 years ago
Find the equation of the line that passes through the point and is perpendicular to the line 3d
professor190 [17]
This on is very easy go to my website so i can explain it better for you

 <span>https://www.youtube.com/channel/UCaxhPMTZBmFcxAZ4hYpBf_w 
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7 0
3 years ago
A sector has angle 2.5 radians and perimeter of 18cm. find the radius of the sector
babunello [35]

Answer:

4 cm

Step-by-step explanation:

Perimeter = 18cm

θ = 2.5 radian

s = rθ, s = Arc length

Perimeter of Sector, P = arc length, s + 2r

Perimeter = rθ + 2r

r = Radius

18cm = r(2.5) + 2r

18cm = 2.5r + 2r

18cm = 4.5r

r = 18 /4.5

r = 4

8 0
2 years ago
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