Page 726 - Algebra 1

*22. Error Analysis Student A and Student B want to find the length of the sides of a (102) square with an area 460 square meters less than 685 square meters. Which student
is correct? Explain the error.
Student A
x2 +460=685 -460 -460
x2 = 225 √ x2 = √ 22 5 x = ±15
The sides of the square are 15 m.
Student B
x2 +460=685 +460 +460
x2 = 1145 √ x2 = √ 114 5 x ≈ ±3.838
The sides of the square are about 3.838 m.
23. Give the coordinates of the parabola’s vertex. Then give the minimum or (89) maximum value.
y
=
4
5
O
x
-8
-4
-4
4
8
__ 24.Add d + 10 .
(90)
25.
(99)
26.
_ulti-Step
2x _
minutes to get to a grocery store that was
M
Louis walked for miles away.
(92)
x3
27.
(95)
28.
(86)
29.
(9 6)
30.
(97)
ball team is going to a camp that is
miles
4x - 16
d - 10 10 - d
__ Solve and check: 18 - 4 = 15.
2
6x -24x
6x
a. Find his rate in miles per minute.
3x
b. If the rate is divided by _1 , what is the new rate? _ x
-8
8x
away. The team traveled 8x - 72 miles on the first day. How many miles are left to
2
8
y
_1 x 2
travel?
Find the midpoint of the line segment with the endpoints (-5, 0) and (1, 14).
Multi-Step A ball is thrown into the air from the top of a cliff at an initial velocity of 32 feet per second. (Use h = -16t2 + vt + 0.)
a. How high is the ball after 2 seconds?
b. What does this height represent?
c. After 3 seconds, the ball is -48 feet. What does this height represent?
Justify List the inequality symbols that result in graphs with dashed boundary lines and list the inequality symbols that result in graphs with solid boundary lines.
2
x2 -11x+18
Football The school foot_
Lesson 105 711