Answer:
yeah sure i got you, whats the question?
Step-by-step explanation:
The mean in minutes of the length of time given= 9.1
<h3>Calculation of mean when frequency table is given</h3>
The formula used for the determination of mean when a frequency table is given is
= total/n
Where total = frequency×midpoint
n = 42
To calculate the total, the mid point of each length of time is determined as follows;
1+4/2 = 2.5 × 4 = 10
4+7/2= 5.5 × 8 = 44
7+10/2 = 8.5 × 14= 119
10+13/2 = 11.5× 9 = 103.5
13+16/2= 14.5×5 = 72.5
16+19/2= 17.5× 2= 35
Total= 10+44+119+103.5+72.5+35 = 384
Therefore mean = 384/42= 9.1
Learn more about mean here:
brainly.com/question/20118982
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Answer:
1. Angles 2, 3 and angles 1,3 are complementary angles(Given)
2. To prove :
Since Angles 2, 3 and angles 1,3 are complementary.
When angles are complementary, then the sum of the measures of angles is 90 degrees.
So, and (Definition of Complementary angles)
3. (Substitution)
4. (Subtraction property of equality)
Step-by-step explanation:
Ok so the formula is 4x + 7 = 19
first things first, let's get the x alone by subtracting the 7 over to the right side
4x = 12
now divide each side of the equation by 4
x = 3
And there is your answer!! :)
It is not true for expressions with negative exponents