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Paraphin [41]
3 years ago
10

HELP PLZ 30 POINTS!

Mathematics
1 answer:
solmaris [256]3 years ago
5 0
I'm so sorry I don't know maybe you have a pic of the question
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What is the value of the expression |-7| + |-4|
weqwewe [10]
Hey there,

Your question states: <span>What is the value of the expression |-7| + |-4|

Sense they both are absolute values, they are pretended to be as normal numbers. By simplifying this, your correct answer would be 11.

Hope this helps.
~Jurgen</span>
7 0
3 years ago
Ming made 7 batches of muffins. She used 1.75 pounds of apples per batch. How many pounds of apples did Ming use to make all the
MrMuchimi

Answer:

12.25

Step-by-step explanation:

Multiply the pounds of apples by the batches.

1.75×7=12.25

4 0
2 years ago
Choose yes or no to tell whether the expression represent a 20% discount off the price of an item that originally cost d dollars
Vaselesa [24]

Answer: B. d - 0.2

Step-by-step explanation: 20%= 20/100= 0.2

Which means = d-0.2

Hope this helped.

8 0
3 years ago
Read 2 more answers
The thicknesses of 81 randomly selected aluminum sheets were found to have a variance of 3.23. Construct the 98% confidence inte
Yuliya22 [10]

Answer:

The confidence interval for the population variance of the thicknesses of all aluminum sheets in this factory is Lower limit = 2.30, Upper limit = 4.83.

Step-by-step explanation:

The confidence interval for population variance is given as below:

[(n - 1)\times S^{2}  /  X^{2}  \alpha/2, n-1 ] < \alpha < [(n- 1)\times S^{2}  / X^{2} 1- \alpha/2, n- 1 ]

We are given

Confidence level = 98%

Sample size = n = 81

Degrees of freedom = n – 1 = 80

Sample Variance = S^2 = 3.23

X^{2}_{[\alpha/2, n - 1]}   = 112.3288\\\X^{2} _{1 -\alpha/2,n- 1} = 53.5401

(By using chi-square table)

[(n – 1)*S^2 / X^2 α/2, n– 1 ] < σ^2 < [(n – 1)*S^2 / X^2 1 -α/2, n– 1 ]

[(81 – 1)* 3.23 / 112.3288] < σ^2 < [(81 – 1)* 3.23/ 53.5401]

2.3004 < σ^2 < 4.8263

Lower limit = 2.30

Upper limit = 4.83.

8 0
2 years ago
Help please? Thank you!
adoni [48]

Answer:

The first answer should be the 3rd one.

The second answer should be the first one.

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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