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2 years ago

Please help with question below!

Mathematics

2 answers:

Charra [1.4K]2 years ago

6 0

Answer:

Step-by-step explanation:

45 is constant, because no mater how many miles you drive, you will always be charged $45. It stays the same

Ipatiy [6.2K]2 years ago

6 0

Answer:

Step-by-step explanation:

your equation would be y= 45+22x and no matter what x equals, you will always have the set $45, so that is your constant.

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Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random sample

horrorfan [7]

Answer:

Confidence interval is 128±2.326 days (between 125.674 days and 130.326 days) in 90% confidence level

Step-by-step explanation:

Confidence interval can be calculated as M±ME where

M is the average pregnancy days of smoking women and
ME is the margin of error in 90% confidence level.

Margin of Error in 90% confidence level can be calculated using the formula:

ME= $\frac{z*s}{\sqrt{N} }$ where

z is the z-value in 90% confidence level (1.645)
s is the standard deviation of pregnancy length (16)
N is the sample size (128)

putting these numbers in the formula, we get:

ME= $\frac{1.645*16}{\sqrt{128} }$ =2.326

then confidence interval is 128±2.326 ( between 125.674 and 130.326 ) in 90% confidence level

5 0

2 years ago

Which pair of coordinate points has a slope of -2?

ladessa [460]

Have u tried socratic

8 0

2 years ago

Write an equation in standard form of the line that contains the point (-1,2) amd is perpendicular to y = 3x - 1

Strike441 [17]

Since it is perpendicular to y=3x-1, the slope must be a negative reciprocal.
there the slope of the perpendicular line is $-\frac{1}{3} x$

So now we have,
$y=- \frac{1}{3} x+b$

To find b, we use the point that the line passes through and substitute it to the y and x values.

$2=- \frac{1}{3} (-1)+b$

which would give us b=5/3

Therefore, the equation of the line is
$y=- \frac{1}{3} x+ \frac{5}{3}$

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2 years ago

If elephant grass grows 2 1/5 inches a day, how many inches will it grow in 5 days?

Sonja [21]

I hope this helps you

5 0

2 years ago

Read 2 more answers

Write an equation in point slope and slope intercept form of a line that passes through the given point and has the given slope

Evgesh-ka [11]

Answer:

Point-Slope: $y+4=-\frac{1}{2}(x+3)$

Slope-Intercept: $y=-\frac{1}{2}x-\frac{11}{2}$

Step-by-step explanation:

The point-slope formula is $y-y_{1}=m(x-x_{1} )$ . The slope-intercept formula is $y=mx+b$ . Since we are given the point and slope, we can directly plug it into the point-slope formula.