High school algebra . three chickens. If 2 turkeys and3 chickens cost 87-20, find the cost of a chicken. SIMPLE EQUATIONS 27 24. What number increased by f of itself is equal to 60 ? 25. Divide $6400 among A, B and C, so that B will get $120niore than A, and C $160 more than A. 26. The net income from an enterprise doubled each year for fiveyears. If the total net income for the five years was $7750, what wasthe income for the first year ? 27. Ii2ab = , (1) Find a, when 6 = 15, m = 6, n = 5. (2) Find b, when a= 12, m= 2, n= 2. (3) Find m, when a= ^, 6 = 6, n = ^. (4) Find n, when a= -3, b
High school algebra . three chickens. If 2 turkeys and3 chickens cost 87-20, find the cost of a chicken. SIMPLE EQUATIONS 27 24. What number increased by f of itself is equal to 60 ? 25. Divide $6400 among A, B and C, so that B will get $120niore than A, and C $160 more than A. 26. The net income from an enterprise doubled each year for fiveyears. If the total net income for the five years was $7750, what wasthe income for the first year ? 27. Ii2ab = , (1) Find a, when 6 = 15, m = 6, n = 5. (2) Find b, when a= 12, m= 2, n= 2. (3) Find m, when a= ^, 6 = 6, n = ^. (4) Find n, when a= -3, b =-6, m = -I2. 28. Show that 6 is a root of the equation 2(a;-l)(a;+2) = 4(a;+3)(a;-5) + (a;-2)(a;+5). 29. Tlie area of the United States is 4000 square miles more thanseventy times the area of England. If the area of the United Statesis 3,560,000 square miles, find the area of England. 30. Solve and verify : (1) 6850+a;=27a;+350. (2) ^x+^x+lx = S380. (3) 1607a;+20= 1762a--11. CHAPTER III POSITIVE AND NEGATIVE NUMBERS. 20. Arithmetical Numbers. In the diagram the hours from12 noon to 12 midnight are represented on the horizontal line, and the temperature at eachhour is shown by the positionof a point on the correspondingvertical line. Thus at 3 the tempera-ture was 61°, at 7 ° and at11 55-5°. The points which show the tem-perature for each hour are cori-nected by a curve. This curvegives a picture of the changes in temperature during thesetwelve hours. These changes might be shown by a column of figures,but the curve exhibits the variations in temperature morereadily to the eye. We can see at a glance when the tempera-ture was rising and when falling, at what hours it was thesame, that it rose or fell more rapidly during certain hoursthan during others. Here we say that we have represented graphically thechanges in temperature, and the curve shown is called a graph. 12 1 2 3 4 5 6 7 8 9 1011 12 BXBRCISE3 13 (18, Oral)Using the diagram, answer questions
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