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Math Topics
High School Algebra 2
Solving Equations and Inequalities
1
Linear and Quadratic Equations, and Formulas
A boat is traveling upstream against a current. If the speed of the boat in still water is \(r\) and the speed of the current is \(c\) then the formula for the distance traveled by the boat is \(d=(r-c) \cdot t\) where \(t\) is time. Find \(c\) if \(d=52\) miles, \(r=16\) miles, and \(t=4\) hours.
Mr. McKeague traveled to Buenos Aires with a group of friends. It was a hot day when he arrived. One of the bank kiosks indicated the temperature was \(25^\circ\text{C}\). Someone asked what that would be on the Fahrenheit scale (the scale they were familiar with), and Budd, one of his friends said, "just multiply by \(2\) and add \(30\)."
What was the temperature in \(^\circ\text{F}\) according to Budd’s approximation?
What is the actual temperature in \(^\circ\text{F}\)?
Why does Budd’s estimate work?
Write a formula for Budd’s estimate.
A manufacturer of calculators knows that the number of calculators she can sell each week is related to the price by the equation \(x=1,300-100p\), where \(x\) is the number of calculators and \(p\) is the price per calculator. What price should she charge if she wants the weekly revenue to be \(\$4,000\)?
2
More Quadratic Equations and Formulas
A company produces and sells copies of an accounting program for home computers. The total weekly cost to produce \(x\) copies of the program is \(C(x)=8x+500\), and the weekly revenue for selling all \(x\) copies of the program is \(R(x)=35x-0.1x^2\). How many programs must be sold for the weekly profit to be \(\$1,200\)?
3
Additional Equations and Formulas
Francine plans a \(60\)-mile training run on her cycle-plane. The time required for the training run, in terms of the wind speed, \(x\), is given by
\[t = \frac{60}{15 - x}\]
If it takes Francine \(9\) hours to cover \(60\) miles, what is the speed of the wind?
4
More Applications and Modeling
Mini Lecture
1. The longest side of a triangle is two times the shortest side, while the medium side is \(3\) meters more than the shortest side. The perimeter is \(27\) meters. Find the dimensions.
2. A man invests \(\$12,000\) in two accounts. If one account pays \(10\%\) per year and the other pays \(7\%\) per year, how much was invested in each account if the total interest earned in the first year was \(\$960\).
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Linear, Quadratic, and Rational Inequalities
6
Equations and Inequalities with Absolute Value
7
summary
If an object is thrown straight up in the air with an initial velocity of \(32\) feet per second, then its height \(h\) (in feet) above the ground at any time \(t\) (in seconds)is given by the formula \(h=32t-16t^2\). Find the times at which the object is on the ground by letting \(h=0\) in the equation and solving for \(t\).










