12.75 is 25% of what number
1 answer:
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Answer:
Step-by-step explanation:
<u>Errors in Algebraic Operations </u>
It's usual that students make mistakes when misunderstanding the application of algebra's basic rules. Here we have two of them
- When we change the signs of all the terms of a polynomial, the expression must be preceded by a negative sign
- When multiplying negative and positive quantities, if the number of negatives is odd, the result is negative. If the number of negatives is even, the result is positive.
- Not to confuse product of fractions with the sum of fractions. Rules are quite different
The first expression is
Let's arrange into format:
We can clearly see in all of the factors in the expression the signs were changed correctly, but the result should have been preceeded with a negative sign, because it makes 3 (odd number) negatives, resulting in a negative expression. The correct form is
Now for the second expression
Let's arrange into format
It's a clear mistake because it was asssumed a product of fractions instead of a SUM of fractions. If the result was correct, then the expression should have been
Answer:
132%
Step-by-step explanation:
The population of Peru = 10904
The population of Franklin = 25248.
Difference = 25248-10904=14,344
Expressing as a percentage of the population of Peru
=132%
Therefore, the population of Franklin is 132% more than the population of Peru.
Question 1:
The generic equation of the line is given by:
Where,
m: slope of the line
b: cutting point with the y axis
Substituting values we have:
Answer:
an equation for the line with slope 2/3 and y-intercept is:
Question 2:
The standard equation of the line is given by:
Where,
m: slope of the line
(xo, yo): ordered pair that belongs to the line
The slope of the line is:
Substituting values:
We choose an ordered pair:
Substituting values:
Rewriting:
Answer:
An equation in slope-intercept form for the line that passes through the points (1, -3) and (3,1) is:
Question 3:
For this case, since the variation is direct, then we have an equation of the form:
Where,
k: constant of variation.
We then have the following equation:
Rewriting we have:
Therefore, the constate of variation is given by:
Answer:
the constant of variation is:
Question 4:
For this case, since the variation is direct, then we have an equation of the form:
Where,
k: constant of variation.
We must find the constant k, for this we use the following data:
y = 24 when x = 8
Substituting values:
Clearing k we have:
Therefore, the equation is:
Thus, substituting x = 10 we have that the value of y is given by:
Answer:
the value of y when x = 10 is:
The generic equation of the line is given by:
Where,
m: slope of the line
b: cutting point with the y axis
Substituting values we have:
Answer:
an equation for the line with slope 2/3 and y-intercept is:
Question 2:
The standard equation of the line is given by:
Where,
m: slope of the line
(xo, yo): ordered pair that belongs to the line
The slope of the line is:
Substituting values:
We choose an ordered pair:
Substituting values:
Rewriting:
Answer:
An equation in slope-intercept form for the line that passes through the points (1, -3) and (3,1) is:
Question 3:
For this case, since the variation is direct, then we have an equation of the form:
k: constant of variation.
We then have the following equation:
Answer:
the constant of variation is:
Question 4:
For this case, since the variation is direct, then we have an equation of the form:
k: constant of variation.
We must find the constant k, for this we use the following data:
y = 24 when x = 8
Substituting values:
Therefore, the equation is:
the value of y when x = 10 is: