Harry got 42 out of 49 correct in his test. What fraction of the marks did he get wrong?
2 answers:
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The volume of rectangular prism is the product of its length, width and height.
So the volume V of prism with length
yards, width 
yards and height of 4 yards will be:
Thus the volume of prism as a mixed number in simplest form will be
cubic yards
So the volume V of prism with length
Thus the volume of prism as a mixed number in simplest form will be
Given:
Four equations in the options.
To find:
The equation which represents a proportional relationship.
Solution:
If y is proportional to x, then
where, k is the constant of proportionality.
In this case if x=0, then y=0. It means the graph of a proportional relationship passes through the origin.
From the given options, only option B, i.e., , is of the
, where,
.
So, the equation represents a proportional relationship.
Therefore, the correct option is B.
Answer:
The sum of the roots is 0.5
Step-by-step explanation:
<u><em>The correct question is</em></u>
What is the sum of the roots of 20x^2-10x-30
we know that
In a quadratic equation of the form
The sum of the roots is equal to
in this problem we have
so
substitute
<u><em>Verify</em></u>
Find the roots of the quadratic equation
The formula to solve a quadratic equation is equal to
substitute
The roots are x=-1 and x=1.5
The sum of the roots are
----> is ok