Page 830 - Algebra 1

6. Error Analysis Two students find 18C5. Which student is correct? Explain the error. (118)
*7. Multi-Step A restaurant charges $16 for a large pizza plus $1.50 per topping. (119) a. Which type of function best describes the cost of a pizza?
b. Write a function that describes the cost of a pizza with x toppings.
8. Jewelry A jewelry store sells necklaces for the cost of the chain plus the cost of the (119) beads. Chains cost $20 each, and beads cost $7.50 each. To which function family
does the equation that describes the cost of a necklace with x beads belong? *9. Multiple Choice Which of the following describes the graph of y = 5x ?
(119) A quadratic B linear C exponential D none of these *10. Geometry A triangle has base b and height b - 4. If its area is written as a function,
Stu_dent A 18C5 = 18!
5!(18 - 5)! = 8568
St_udent B 18C5 = 18!
(18 - 5)! = 1,028,160
(119) to which function family does the function belong?
11. Identify the function family to which y = 2 - 1100x belongs.
(119)
*12. Write A fair coin is flipped many times in a row. The probability of all flips (119) _1 x
resulting in heads is given by P(all heads) = (2 ) , where x is the number of flips. What type of function is this?
13. Multi-Step A teacher randomly selects 4 helpers from her class of 22. (118) a. How many ways can 4 helpers be selected?
b. What is the probability that Shawn, Tonia, Torie, and Reid are all chosen? *14. If ∠A = 14°, find sin A, cos A, and tan A to the nearest ten-thousandth.
(117)
15. Error Analysis Two students are finding the value of x in the figure. Which student (117) is correct? Explain the error.
21
A 63° x
C
8000
Student A
sin 63° = _x 21
21 · sin 63° = x 18.71 ≈ x
Student B
cos 63° = _x 21
21 · cos 63° = x 9.53 ≈ x
*16. Aviation An airplane begins making its descent at an (117) angle of 11° with the horizontal. If the plane is at
an altitude of 8000 feet and will remain at this
angle throughout its descent, how far away is the plane from its landing point?
11°
x
B
Lesson 119 815