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3 years ago

Select the two equivalent expressions.

Mathematics

1 answer:

Allushta [10]3 years ago

6 0

Answer:

B. and D.

B. 10m+3m+m+10+6=4m+16

D. 4(m+4)=4m+16

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Which construction could this NOT be?

ser-zykov [4K]

Answer:

Perpendicular Bisector

Step-by-step explanation:

CD is parallel to AB, so this could be the construction of a parallel line or a rhombus. Angle DBE is congruent to angle A, so this can be the construction of a congruent angle.

Answer: D) Perpendicular Bisector

4 0

3 years ago

A random sample of 20 married women showed that the mean time spent on housework by them was 29.8 hours a week with a standard d

DanielleElmas [232]

Answer:

95% confidence interval for the mean time spent on housework per week by all married women.

( 26.66 , 32.94)

Step-by-step explanation:

Step(i):-

Given random sample size 'n' = 20

Mean of the sample (x⁻ ) = 29.8 hours

Standard deviation of the sample (S) = 6.7

Given Margin of error = 3.14

Step(ii):-

95% confidence interval for the mean is determined by

$(x^{-} - t_{0.05} \frac{S}{\sqrt{n} } , x^{-} +t_{0.05} \frac{S}{\sqrt{n} })$

We know that margin of error is determined by

$M.E = \frac{t_{0.05}XS.D }{\sqrt{n} } = 3.14$

Now 95% confidence interval for the mean time spent on housework per week by all married women.

$(29.8 - 3.14 , 29.8+3.14)$

( 26.66 , 32.94)

8 0

3 years ago

Tommy has a history test on Monday morning. He writes down the number of minutes he studies for the test each day for a week. Us

Schach [20]

To find the average, add up all the numbers, then divide that answer by the quantity of numbers.

STEP 1:
add all numbers

=30 + 20 + 0 + 0 + 0 + 0 + 120
=170 total

STEP 2:
divide total from step 1 by 7 (total quantity of numbers given, including zeros)

=170 ÷ 7
=24.2857
=24.3 rounded to nearest tenth

***You could also calculate the average by adding only non-zero results (20,30,120) and then dividing by 3 (the quantity of only non-zero numbers).

ANSWER: The average number of minutes studied per day is 24.3.

Hope this helps! :)

7 0

3 years ago

Read 2 more answers

217.72 million in scientific notation

zepelin [54]

2.17720 × 10^2 is the answer

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3 years ago

Which description of the graph of the linear equality y > 3x - 8 is correct?

Alexxx [7]

Answer:

Option The graph will be a dashed line with a y-intercept of negative eight and a slope of three. The graph will be shaded above