LT 3a: I can represent real­world situations with inequalities.
p.32
Write an inequality that describes the graph.
1)
2)
Write and graph an inequality that describes the situation.
No one under age 17 will be admitted without a parent or guardian.
3)
Three or more people make a carpool.
Keith has $500 in a savings account at the beginning of the summer. He wants to have at least $200 in the account by the end of the summer.
He withdraws $25 each week for food, clothes, and movie tickets. A) Write an inequality that represents Keith's situation. B) How many weeks can Keith withdraw money from his account?
4)
Yellow Cab Taxi charges a $1.75 flat rate in addition to $0.65 per mile. Katie has no more than $10 to spend on a ride.
A) Write an inequality that represents Katie's situation. B) How many miles can Katie travel without exceeding her limit?
5)
Ezra received $50 from his grandparents for his birthday. He makes $7.50 each week for odd jobs he does around the neighborhood. Since his birthday, he has saved more than enough to buy the $120 gift he wants to buy for his parents' 20th wedding anniversary. p.33
A) Write an inequality that represents Ezra's situation. B) How many weeks ago was Ezra's birthday?
Summary:
CW p.33­34 (1, 4, 6)
1.
For a scholarship competition, Eva had to write an essay. For the essay Eva had to write more than 250 words, but it couldn't exceed 500 words. Write an inequality that demonstrates Eva's situation, then graph it.
P p.33­34 (all)
2.
Mars has a maximum temperature of ­7 at the equator and a minimum temperature of ­133
at the winter pole. Write an inequality that describes the possible temperatures on Mars, then graph it.
p.34
3.
4.
At a carnival, the cost to play a bowling game is $2 p lus $0.25 for each attempt to knock over the pins. Which inequality would you use to find the number of attempts, a, you can make if you have $10?
Tom earns $50 to start a painting job and $20 per hour to complete it. All jobs he accepts earn him at least $300. If h represents the number of hours spent painting, which inequality describes Tom's situation?
A. 0.25a + 2 ≥ 10
B. 0.25a + 2 ≤ 10
C. 0.25a + 2 < 10
D. 0.25a + 2 > 10
Solve and graph the inequality that you chose for your answer.
5.
You are stacking books on a shelf that has a height of 66 centimeters. Each book has a thickness of 4 centimeters. Write and solve an inequality to find the possible numbers of books that you can stack, then graph it.
A. 50 + 20h > 300
B. 50 + 20h ≥ 300
C. 50 + 20h < 300
D. 50 + 20h ≤ 300
Solve and graph the inequality that you chose for your answer.
6.
A blank CD can hold 70 minutes of music. So far you have burned 25 minutes of music onto the CD. You estimate that each song lasts 4 minutes. Write and solve an inequality that shows the possible numbers of additional songs that you can burn onto the CD, then graph it .
answers p.32
answers p.33
answers p.34
Attachments
Two­step inequalities.pdf