16 Chapter 1Solving Linear EquationsExercises1.2 Dynamic Solutionsavailable at BigIdeasMath.comMonitoring Progress and Modeling with MathematicsMonitoring Progress and Modeling with MathematicsIn Exercises 3−14, solve the equation. Check your solution. (See Examples 1 and 2.)3. 3w + 7 19 4. 2g 13 35. 11 12 q 6. 10 7 m7.5 z — 4 3 8. a — 3 + 4 69. h + 6 — 5 2 10. d 8 — 2 1211.8y + 3y 44 12. 36 13n 4n13.12v + 10v + 14 8014.6c 8 2c 1615. MODELING WITH MATHEMATICS The altitude a (in feet) of a plane t minutes after liftoff is given by a 3400t + 600. How many minutes after liftoff is the plane at an altitude of 21,000 feet?16. MODELING WITH MATHEMATICS A repair bill for your car is $553. The parts cost $265. The labor cost is $48 per hour. Write and solve an equation to nd the number of hours of labor spent repairing the car.In Exercises 17−24, solve the equation. Check your solution. (See Example 3.)17. 4(z + 5) 32 18. 2(4g3) 3019. 6 + 5(m + 1) 26 20. 5h+ 2(11 h) 5 21. 27 3c 3(6 2c) 22. 3 12y 5(2y 7)23. 3(3 + x) + 4(x 6) 4 24. 5(r + 9) 2(1 r) 1USING TOOLS In Exercises 25−28,  nd the value of the variable. Then  nd the angle measures of the polygon. Use a protractor to check the reasonableness of your answer.25. 45°k°2k°Sum of anglemeasures: 180 26. 2a°2a°a°a°Sum of anglemeasures: 36027.(2b 90)bb90(b + 45)32Sum of anglemeasures: 540 28. In Exercises 29−34, write and solve an equation to nd the number.29. The sum of twice a number and 13 is 75.30. The difference of three times a number and 4 is 19.31. Eight plus the quotient of a number and 3 is 2.32. The sum of twice a number and half the number is 10.33. Six times the sum of a number and 15 is 42.34. Four times the difference of a number and 7 is 12.(x + 10)°120°120°100°x°120°Sum of anglemeasures: 720Vocabulary and Core Concept CheckVocabularyand Core ConceptCheck 1. COMPLETE THE SENTENCE To solve the equation 2x + 3x 20,  rst combine 2x and 3x because they are _________. 2. WRITING Describe two ways to solve the equation 2(4x 11) 10.