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dimulka [17.4K]
3 years ago
5

Help please ASAP ASAP

Mathematics
2 answers:
nexus9112 [7]3 years ago
6 0

Answer:

-1/12

Step-by-step explanation:

The slopes of perpendicular lines are equivalent to -1.

ziro4ka [17]3 years ago
3 0

Answer:

-1/4

Step-by-step explanation:

Subtract 12x from both sides to get -3y=-12x+81

Divide both sides by -3 to get y=4x-27

Take the negative reciprocal of 4, which is -1/4

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The length of a rectangle is twice the width. Find the width if the perimeter is 36 centimeters. Define a variable, write an equ
VARVARA [1.3K]

Answer:

12cm

Step-by-step explanation:

1. Define the variable:

x = length of the rectangle

2x = width of the rectangle

2. Set the equation:

x + 2x is half of the rectangle

2(x + 2x) is the perimeter

So,

2(x + 2x) = 36

2x + 4x = 36

6x = 36

x = 6

Since x is the length, multiply it by 2 to find the width.

2x = 12

3 0
2 years ago
A district-wide test is used to measure math attitude in freshmen in high school students, with a mean of 78 and a standard devi
fiasKO [112]

Answer:

Step-by-step explanation:

Given that

Population mean \mu=78

std deviation \sigma =12  = 12

sample size n =36

Sample mean = \bar x = 85

H_0: \bar x = 85\\H_a: \bar x \neq 85

(Two tailed test)

Mean difference = 7

Std error =\frac{\sigma}{\sqrt{n} } \\=\frac{12}{6} \\=2

Since population std dev is known and n>30 we use Z test

Z statistic = \frac{7}{2} =3.5\\

p value <0.001

Since p value is <0.01, at 1% significance level, we reject H0.

There is significant difference between sample mean and population mean.

7 0
3 years ago
Find the range, median, and mode of this stem and leaf plot. Please help I have no idea how to do this
andre [41]
what yung papi said
4 0
3 years ago
Which statements are true regarding the area of circles and sectors? Check all that apply.
AveGali [126]

Answer:

The correct options are a,b.

Step-by-step explanation:

The area of sector of a circle equals

Area of a sector = \theta r^{2}

where

\theta is the angle subtended at the center by the sector

r is the radius of circle

This indicates that area of the sector depends on:

1) Radius of circle

2) Angle  subtended at the center by the sector

3) Area of sector does not depend on pi.

Also if we know the area of the sector only  we cannot calculate area of area of whole triangle as we need one more information either angle of the sector and vice versa.

3 0
3 years ago
Read 2 more answers
Chris is riding her bike for 10 miles. She averages 12 mi/h. how many more minutes must she ride before she travels 60 miles?
madam [21]

Answer:

5 Minutes

take 10 and add 12 for each minute until you pass 60

3 0
3 years ago
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