# BLACK HISTORY MONTH

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• BLACK HISTORY MONTHThese problems were created to be used on the High School level as warm-up exercises or to fill in time at the end of a class. There are enough exercise to take you through 4 weeks with an extra 3 problems included. They range from algebra to trigonometry. I hope this will not only be educational, but fun!Enjoy your missionMs. Valerie Russell

• FYI: Geography: Benjamin Banneker, a self taught mathematician, was the first African-American to publish an almanac. He is most noted for being the assistant surveyor on the team that designed the ten-mile square of Washington D.C. The White House is located in the center of the square, at the intersection of Pennsylvania Avenue and New York Avenue. Let 5x+7y=0 represent New York Avenue and let 3x+8y=305 represent Pennsylvania Avenue.

Your mission today is to find the coordinates for the White House.

• MISSION ACCOMPLISHED-5x+7y=0 3(5x+7y)=0 -5x=-175 -5x+7(25)=0 3x+8y=305 5(3x+8y)=305 x=35 -5x+175=0

-15x+21y=0 15x+40y=1525 61y=1525 y = 25

The coordinate for the White House is (35,25).

• FYI: Wilma Rudolf (1940-1994) was the first African-American woman to win three gold medals at a single Olympic games. She won the 100-meter sprint, the 200-meter dash, and the 4* 100 meter relay at the 1960 Olympic Games.

Given: The runners in a 200 meter dash race ran around the curve of a track. If the runners start and finish at the same line, the runner on the outside lane would run farther than the other runners. To compensate for this situation, the starting points of the runners are staggered.

If the radius of the inside lane is X and each lane is 2.5 ft. wide, find out how far apart should the officials start the runners in the two inside lanes.

• Mission Accomplished

Outside circle Inside circlePi ( x+ 2.5) - Pi x = 3.14x + 2.5(3.14) 3.14x = 2.5 (3.14) = 7.85

The two runners should start about 7.85 meters apart.

• FYI: Elmer Simms Campbell was the first African-American cartoonist to work for national publications. He contributed cartoons and other art work to Esquire, Cosmopolitan, and Redbook, as well as syndicated features in 145 newspapers.Given: The Lion King was the top-grossing film of the year, making an estimated 300.4 million at the box office. On a Saturday afternoon the Johnson and Olivera families decided to go see The Lion King together. The Johnson family, two adults and four children can afford to spend \$30 on movie tickets while the Olivera family, two adults and two children can afford to spend \$21.50. Different theatures around town charge different amounts for adult and chid tickets.

Your Mission: Find out what price can the Johnsons and Oliveras afford to pay for each adult and each child .

• Mission AccomplishedLet a = 1 adult ticket and c = 1 child ticket

2a + 4c = 30 2a +4 (4.25) = 30-( 2a + 2c = 21.50 ) 2a + 17 = 30 2c = 8.5 - 17 -17 2 2 2a = 13 C= \$4.25 2 2 a = \$6.50 They can afford to pay \$6.50 for an adult ticket and \$4.25 for a childs ticket.

• FYI:The Moscow Papyrus contains records of early counting and measuring. It contains 25 problems. Of these, 11 concernproper portions for making different strengths of beer and bread. Given: The longest loaf of bread ever baked was 2,132 feet 2.5 inches.

Todays Mission:If this loaf were cut into .5 inch slices, find out how many slices of bread would there have been.

• Mission AccomplishedFirst change 2132 ft. 2.5 in. to inches. 2132 * 12 = 25,584 25,584 + 2.5 = 25,586.5 inchesNext divide by .525,586 / .5 = 51,173There would have been 51,173 slices of bread.

• FYI:In 1980, there were 1.2 million elephants living in Africa. Because the natural grazing lands for the elephant are disappearing due to increased population and cultivation of the land, the number of elephants in Africa has decreased by about 6.8% per year.

Your Mission:A) Write an equation to represent the population of the elephants in Africa.

B) Find the year in which the population of Africa dropped by half of the population of the year 1980.

• Mission AccomplishedA) Y= c(1-r)^t = 1.2(1-.086)^t

B) .6 > 1.2( 1- .068)^t 1.2 1.2 .5 > .932^tLog .5 > t log .932 t> log .5 log .932 t> 9.8 year Towards the end of 1989 the elephant population dropped to less than half that of 1980.

• FYI: The Babylonians computed 2 to determine the diagonal of a square of side 1. This indicates, and other texts confirm that the Babylonians knew the Pythagorean theorem over a millennium before Pythagoras lived. They did not prove it. They knew that in a right or 90 triangle the sum of the squares of the lengths of the two shorter sides or legs (a+b) equals the square of the length of the hypotenuse c.

Your Mission:Show your skill by picking up where the Babylonians left off. Prove the Pythagorean Theorem.

• Mission AccomplishedGiven: Right triangle ABC with right angle at C

Prove: a + b = c

Proof: Draw the altitude from C to AB. Let AB = c, AC=b, BC=a, AD=x, DB=y, and CD=h. Two geometric means now exist: c/a = a/y and c/b = b/x C a=cy b= cx Add the equations: b aa + b = cy + cx h a + b = c(y+x) a + b = c A B x D y c

• FYI: This was an actual problem from the Ahmose Papyrus. It is considered the antecedent to the famous Mother Goose rhyme .

As I was going to Saint Ives.I met a man with 7 wives. Each wife had 7 sacks;Every sack had seven cats;Every cat had seven kits;Kits, cats, sacks, and wives,How many were going to Saint Ives

• Mission Accomplished

7*7*7*7=7^4=2401There were 2,401 going to Saint Ives.

• FYI: In 2000 BC, Egyptians used a loop of rope knotted at 12 equal intervals to determine the boundaries of their properties each year after the Nile flooded! They stretched the rope around three steaks so that the measures of the sides of the triangle we 3,4, and 5. This right triangle was used to establish the corners of their fields.

The 3,4,5 right triangle is called a Pythagorean triple. Pretend you lived back during the days of the Egyptians and you owned 4 pieces of property, all of which had to be bounded by right triangles.Your Mission: Find 4 other triples that you can use to tie off your property.

• Mission Accomplished

• The Berlin PapyrusFYI: The Berlin Papyrus was created from fragments of early Egyptian tablets dating back prior to 1850 B.C. It solved simultaneous equations in verbal form.

*Your mission today is to solve 2 of the actual problems found on the Berlin Papyrus. x+y=100 x+y=400 4x-3y=0 4x-3y=0

• Mission AccomplishedX+y=100 x+y=4004x - 3y = 0 4x - 3y = 0 x = (3/4)y 4x = 3y , x = (3/4)y ,4 4 (3/4 y) + y =100 (3/4 y) + y = 400(9/16)y + (16/16)y = 100 (9/16)y + 16/16)y = 400y/16) = 16 [ (25/16)y = 400 ](5/4)y = 10 2y) =5y = 40 5y = 80y=8 y = 16

X = (3/4)(8) x = (3/4)(16)X = 6 x = 12

• FYI: The Greek mathematician Thales was the first to measure the height of a pyramid by using geometry. He showed that the ratio of a pyramid to a staff was equal to the ratio of one shadow to the other.Given: The height of a staff EF is 5 feet and the length of its shadow FD is 6 feet.Your mission today: Find the height of a pyramid if the shadow of the pyramid BC is 576 feet, using similar triangles.

• Mission Accomplished

x/576 = 5/6 6x = 5(576) 6 6

x = 480 feet, the height of the pyramid

• FYI:The Noks were one of Africas earliest civilizations, dating back to 500 B.C.

Your mission today is to determine a valid conclusion can be reached from the two true statements. If it is a Nok sculpture, then it has hallowed out eyes and mouth and if a sculpture has hallowed out eyes and mouth, then it has a

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