Problem ABCD is a square of side 10 cm. PQRS is a square inside ABCD. PQBA, QRCB, RSDC, and SPAD are identical trapezia, each of area 16 cm^{2}. What is the height of each trapezium if PQ is parallel to AB and SR is parallel to DC?
Problem
From where he stands, one step toward the cliff would send the drunken man over the edge. He takes random steps, either toward or away from the cliff. At any step his probability of taking a step away is 2/3, of a step toward the cliff 1/3. What is his chance of escaping the cliff?
Problem
A grade of -5% is followed by a grade of 1%, the grades intersecting at the vertex (Sta. 10 + 060). The change of grade is restricted to 0.4% in 20 m. Compute the length of the vertical parabolic sag curve in meters.
Problem
A job posted at jobstreet.com offered a starting salary of \$40,000 per year and guaranteeing a raise of \$1600 per year for the rest of 5 years. Write the general term for the arithmetic sequence that models potential annual salaries.
A. a_{n} = 38,400 + 1600n
B. a_{n} = 33,400 + 2600n
C. a_{n} = 36,400 + 1400n
D. a_{n} = 34,400 +1800n
Problem
A given alloy contains 20% copper and 5% tin. How many pounds of copper and of tin must be melted with 100 lb of the given alloy to produce another alloy analyzing 30% copper and 10% tin? All percentages are by weight.
A. 20.5 lb copper and 4.5 lb tin
B. 17.5 lb copper and 7.5 lb tin
C. 19.5 lb copper and 5.5 lb tin
D. 18.5 lb copper and 6.5 lb tin
Problem
A nutritionist in a hospital is arranging special diets that consist of a combination of three basic foods. It is important that the patients on this diet consume exactly 310 units of calcium, 190 units of iron, and 250 units of vitamin A each day. The amounts of these nutrients in one ounce food are given in the following table.
Units Per Ounce
Calcium
Iron
Vitamin A
Food A
30
10
10
Food B
10
10
30
Food C
20
20
20
How many ounces each food must be used to satisfy the nutrient requirements exactly?
A. 6 ounces of Food A, 5 ounces of Food B and 3 ounces of Food C
B. 3 ounces of Food A, 5 ounces of Food B and 6 ounces of Food C
C. 6 ounces of Food A, 3 ounces of Food B and 5 ounces of Food C
D. 5 ounces of Food A, 3 ounces of Food B and 6 ounces of Food C