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11Alexandr11 [23.1K]
3 years ago
10

McKenna was asked to write the following expression in standard form.

Mathematics
1 answer:
Neko [114]3 years ago
6 0

Answer: -15a - 27

Step-by-step explanation:

McKenna made her first mistake in Step 2. You would need to multiply -5 by 3a and 6, not add it to 3 first.

The correct steps would be:  

3−5(3a+6)

3+(−5)(3a+6) Step 1

3 - 15a - 30 Step 2

-15a - 27 Step 3

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A soccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.05 in.
Pavel [41]

Answer:

107,426, bigger

Step-by-step explanation:

Given that a soccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.05 in.

Margin of error = 0.05 inches

Since population std deviation is known we can use z critical value.

(a) i.e. for 99% confidence interval

Z critical = 2.58

2.58(\frac{0.20}{\sqrt{n} } )106.50\\n>107

A minimum sample size of 107 needed.

b) 2.58(\frac{0.40}{\sqrt{n} } )426

Here minimum sample size = 426

Due to the increased variability in the population, a bigger sample size is needed to ensure the desired accuracy.

8 0
3 years ago
12 quarts equals 24 pints
vitfil [10]
Yes, 12 quarts indeed equals 24 pints!
6 0
4 years ago
Read 2 more answers
What is the inequality x+5<2
Vlad [161]

Answer:

x < - 3

Step-by-step explanation:

Given

x + 5 < 2 ( subtract 5 from both sides )

x < - 3

8 0
4 years ago
Read 2 more answers
SUMMER SCHOOL PLZ HELP
LuckyWell [14K]
Question 1:
The labeled points are points from the drawing are:
A,B,C,D,E

Question 2:
The intersection of the two lines is a point since the necessary condition for the two lines to intersect is that they should be on the same plane, hence they form a point.
Thus the correct answer is: True

Question 3:
The name for a given line is given from the end points that forms the line. Hence given that the two points forming the line is B and P, the correct answer is option C]

Question 4:
There are 5 letters and you use 2 to name the line, so the number of choices will be given by:
5C2=5!/(2!(5-2)!)
=(5×4×3×2×1)/(2×1×3×2×1)
=10


Question 5:
Collinear points are three or more points which lie on the same single straight line. In our case the points are:
T,X,V
8 0
3 years ago
Please answer the question from the attachment.
borishaifa [10]
15% means  0.15 .

'of' means 'times'.

The problem is      (0.15) x (63.2) .

I think you can take over and do it from there.
6 0
3 years ago
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