3 years ago

Y=5(x-2)^2 +4 Is the parabola opening up or down? What is the axis of symmetry?

Mathematics

1 answer:

lara31 [8.8K]3 years ago

5 0

See attachment for your answer:

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The number of free song downloads is determined using a ratio when you purchase 40 songs you get 24 free song downloads how many

natka813 [3]

34 because 24 is 6x4 and 40 is 6.5 but you obviously round up so 7x6 so18 free songs is is 6x3 you just take away 6 to your number so 40-6+=34 so 34

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3 years ago

What fraction of each gallon of purple paint is red paint?

motikmotik

Answer:

4/7

Step-by-step explanation:

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3 years ago

9.4 The heights of a random sample of 50 college stu- dents showed a mean of 174.5 centimeters and a stan- dard deviation of 6.9

gladu [14]

Answer: a) (176.76,172.24), b) 0.976.

Step-by-step explanation:

Since we have given that

Mean height = 174.5 cm

Standard deviation = 6.9 cm

n = 50

we need to find the 98% confidence interval.

So, z = 2.326

(a) Construct a 98% confidence interval for the mean height of all college students.

$x\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=(174.5\pm 2.326\times \dfrac{6.9}{\sqrt{50}})\\\\=(174.5+2.26,174.5-2.26)\\\\=(176.76,172.24)$

(b) What can we assert with 98% confidence about the possible size of our error if we estimate the mean height of all college students to be 174.5 centime- ters?

Error would be

$\dfrac{\sigma}{\sqrt{n}}\\\\=\dfrac{6.9}{\sqrt{50}}\\\\=0.976$

Hence, a) (176.76,172.24), b) 0.976.

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3 years ago

28 is increased by 150%. what's the final number

sp2606 [1]

Answer:

Step-by-step explanation:

20x(1+150%)

28x(1+1.5)

28x2.5

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2 years ago

10-x=5<br> What is X???I need help

Bogdan [553]

10-x =5

-x= 5-10

-x = -5

x= 5

<h2>Answer : x=5</h2>

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3 years ago

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