How to round to the naerst 10?
1 answer:
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If the current son's age is x, the current age of the father is .
In 20 years they will be, respectively, and
years old, and we know that the father will be 3 times as old as his son:
The quadratic equation has solutions
So, the two solutions are
We clearly can't accept negative values as solution for a problem involving the age of a person, so the only feasible solution is x=8, and we deduce that the father's age is 8 squared, i.e. 64.
<em>Write the equation of a line perpendicular to y=-12x+2 going </em>
<em> through (0, -1)</em>
<em />
<em> </em>
First, let's take a look at our provided information:-
- A line
- A point (0, -1)
- The line
is perpendicular to the line that goes through (0, -1)
If two lines are perpendicular to each other, their slopes are opposite reciprocals of each other.
So we take the slope of the given line, which is -12, change its sign from minus to plus:-
And now, We flip the number over:-
Now that we've found the slope of the line, let's find its equation.
The first step is to write it in point-slope form as follows:-
Replace letters with numbers,
On simplification,
On further simplification,
Subtracting 1 on both sides,
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