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alexgriva [62]
3 years ago
9

Please solve in a big hurry!: will name the Brainliest!!!

Mathematics
2 answers:
trapecia [35]3 years ago
8 0

Answer:

B.

4x+9 = 2x-1

Step-by-step explanation:

dangina [55]3 years ago
7 0

Answer:

Third one

Step-by-step explanation:

nine more than four times a number:

4x+9

x is the "mystery number"

"is the same as" is just another way of saying "equals"

one less than twice the number ("the number" is just x):

2x-1

put them all together:

4x+9=2x-1

don't over look it; break it down

<3

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Show working out for 1/5 of 2 litres
Kobotan [32]
1/5 of 2 liters...." of " means multiply

1/5 * 2/1 = 2/5 liters <==
8 0
3 years ago
Pedro bought a skateboard last week. The list price of the skateboard was $64.90. He has a 20% coupon. He has to pay 8.5%
Lapatulllka [165]
Take the original price and times it by .8 (you could times it by .2 and then subtract from the original price but multiplying it by .8 is much easier) 64.9x.8= 51.92 take your discounted price and multiply it by 1.085 to account for the sales tax (you multiply by 1.085 to account for the price of the item and the tax you could times it by .085 and then add it on to the price of the item but this way it shortens the amount of steps needed) 51.92x1.085= 56.3332
Round to the nearest cent
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3 0
2 years ago
The distribution of scores on a recent test closely followed a Normal Distribution with a mean of 22 points and a standard devia
maksim [4K]

6.68% of the students scored at least 19 points on this test while the 85 percentile has a test score of 24.08 points

The z score is used to determine by how many standard deviations the raw score is above or below the mean. The z score is given by:

z=\frac{x-\mu}{\sigma} \\\\where\ \mu=mean.\sigma=standard\ deviation, x=raw\ score\\\\Given\ that\ mean(\mu)=22,standard \ deviation (\sigma)=2\\\\For\ x>19:\\\\z=\frac{22-19}{2}=1.5

P(x > 19) = P(z > 1.5) = 1 - P(z < 1.5) = 1 - 0.9332 = 0.0668

6.68% of the students scored at least 19 points on this test

b) 85 percentile corresponds to a z score of 1.04

z=\frac{x-\mu}{\sigma}\\\\1.04 =\frac{x-22}{2} \\\\2.08=x-22\\\\x=24.08

The 85 percentile has a test score of 24.08

Find out more at: brainly.com/question/25012216

7 0
3 years ago
What is the equation of the parabola, in vertex form, with vertex at (-2,-4) and
Arlecino [84]

Answer:

Step-by-step explanation:

The distance between the vertex and the directrix is 4 units, that means that p = 4 in the equation

(y-k)^2=4p(x-h) and h and k are the coordinates of the vertex. Filling in:

(y+4)^2=4(4)(x+2) which simplifies to

(y+4)^2=16(x+2) choice C

8 0
3 years ago
Select the correct answer from the drop-down menu.
Svetllana [295]
X^3-2x^2-5x+6
From the shape, you can immediately tell it’s one of the x^3 functions. Then I just put both in my calculator and looked for which one matched
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2 years ago
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