Page 817 - Algebra 1

12. Error Analysis A $1500 investment earns 8% simple interest. Two students find the (116) value of the account after 25 years. Which student is correct? Explain the error.
13. Multi-Step A boy plans to invest $100 in an account that pays 10% interest
(116) compounded annually for 10 years. Another option is an account that earns 20% interest compounded annually for 5 years. Which will earn him more money, and
how much more?
14. Graph the cubic function y = x3 + 3. Use the graph to evaluate the equation
(115) forx=0.
15. Error Analysis Two students draw a graph of the equation y = 2x3. Which student
(115) is correct? Explain the error.
20
16. Packaging A rectangular box has a volume of V = x3 + 3 cubic units. Use a table (115) or graph to find the value of x that corresponds to a volume of 30 cubic units.
17. Use the quadratic formula to solve 2x2 + 9 = 9x. Check the solutions. (110)
Student A
I = Prt
I = 1500 · 0.08 · 25 I = 3000
$3000
Student B
I = Prt
I = 1500(0.08)(25) I = 3000
3000 + 1500 = 4500 $4500
Student B
y
10
O
x
2
4
-4
-2
-4
-10
2
4
-8
-20
18. Find 12P3. (111)
19. Solve x2 + 5 = 9. (102)
Near a planet, a satellite follows a trajectory described by the equation y = - 8 . At what coordinates will the radio signal intersect the trajectory?
(113) x2 +2x-2=0.
22. Multiple Choice What is the domain of the function f(x) = 2 √ x + 6 - 1?
(114) A x≥-5 B x≥-6 C x≥6 D x≥0 23. Write Describe the graph of f(x) = √ x + 4 in terms of its parent function.
(114)
24. Solve and graph the inequality 3⎢8x + 2 < 12. (101)
20. Astronomy
(112) y = _x2 + _7 . The trajectory is intercepted by a radio signal represented by the line
8_9x 4
21. Use the discriminant to find the number of real solutions of the equation
802 Saxon Algebra 1
Student A
8
y
4
O
x
-4
-2