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3 years ago

The commutative property can be used with subtraction. For example, the problem

Mathematics

2 answers:

irina [24]3 years ago

4 0

Answer:

false

Step-by-step explanation:

8 - 4 - 6= -2

6 - 4 - 8= -6

Ghella [55]3 years ago

3 0

Answer:

true

Step-by-step explanation:

all it is doin is switching the numbers, excuse my grammar

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In the diagram EF is the bisector of <DEF = m < D' EF.

finlep [7]

hii! i just wanted to say hope you're having a fantastic day and hope that things are going well (: stay strong and stay safe!

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3 years ago

A fish aquarium that needs water measures 5ft long by 3 feet wide by 2 feet tall. If Josh only has has 12ft of water, how much m

Pepsi [2]

Answer:

Step-by-step explanation:

18 ft

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3 years ago

Read 2 more answers

The data show systolic and diastolic blood pressure of certain people. Find the regression equation, letting the first variable

MakcuM [25]

Full Question:

The data show systolic and diastolic blood pressure of certain people. Find the regression equation, letting the first variable be the independent (x) variable. Find the best predicted diastolic pressure for a person with a systolic reading of 113. use a significance level of 0.05.

Systolic| 150 129 142 112 134 122 126 120

Diastolic| 88 96 106 80 98 63 95 64

a. What is the regression equation?

^y = __ + __x (Round to two decimal places as needed.)

b. What is the best predicted value?

^y is about __ (Round to one decimal place as needed.)

Answer:

A. yhat = a + bx = -10.64 + 0.75x

B. 74.0

Step-by-step explanation:

A. To find the regression equation here, we apply the formulas and then apply it to find the value of y given value of x:

calculate xbar and ybar which is the average of the variables:

Where n(number of values in x or y)=8

xbar = sum of x/n = 129.375

ybar = sum of y/n = 86.25

to calculate b

b= [Sum x^2 * Sum y - Sum x * Sum x*y] / [N*Sum x^2 - (Sum x)^2]

b = 0.74891

To calculate a

a = ybar - b * xbar = -10.64023

Regression equation:

y=mx+b= -10.64 + 0.75x

B. given x = 113,

y = -10.64023 + 0.74891 * 113

y= 74.0

5 0

3 years ago

which pair of ratios forms a proportion? hint: check for cross products. a. 6/9=9/12 b. 8/16=10/21 c. 6/15=10/25 d. 4/14=6/27

Anna35 [415]

Answer:

c. 6/15 = 10/25

Step-by-step explanation:

Using the hint, we can form the cross products of the offered choices:

a. 6(12) vs 9(9) ⇒ 72 vs 81 . . . not a proportion

b. 8(21) vs 16(10) ⇒ 168 vs 160 . . . not a proportion

c. 6(25) vs 15(10) ⇒ 150 vs 150 . . . IS A PROPORTION

d. 4(27) vs 14(6) ⇒ 108 vs 84 . . . not a proportion

The cross products are the same for choice C, so that is a pair of ratios that form a proportion:

6/15 = 10/25

6 0

3 years ago

Patrisse and Makayla began arguing about who did better on their tests, but they couldn't decide who did better given that they

hodyreva [135]

a) Z-score for Patrisse test grade is 0.7288

b) z-score for Makayla test grade is -0.7441

c) Patrisse did better.

<h3>What is z- score?</h3>

A Z-score is a numerical measurement that describes a value's relationship to the mean of a group of values.

Z-score for Patrisse test grade.

X= 81.4, $\mu$ = 72.8, $\sigma$ = 11.8

Z= x- $\mu$ / $\sigma$

Z= 81.4 - 72.8/ 11.8

Z= 0.7288

Now, z-score for Makayla test grade.

X= 60.6, $\mu$ = 67, $\sigma$ = 8.6

Z= x- $\mu$ / $\sigma$

Z= 60.6 - 67/ 8.6

Z= -0.7441

Hence, Patrisse did better as she had better z- score.

Learn more about this concept here:

brainly.com/question/23261840

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8 0

2 years ago