Test 9, Units 6 - 8 (8.1 - 8.13) Flashcards
complementary angles contain 180 degrees
false - complementary angles contain 90 degrees
a right angle contains 90 degrees
true
mathematical probability is expressed as a ratio
true
2 angles with a common ray between them are adjacent angles
true
the opposite sides of a rectangle are parallel
true
perpendicular lines form right angles
true
a compass is used to measure the number of degrees in an angle
false - a compass is used to draw circles
angles are formed by 2 rays
true
similar triangles have the same size and shape
false -
a divided bar graph is another name for a histogram
false
scale 2 in. = 50 mi.
4 in. =
2 4 cross multiply 2x = 200
— = — x = 100
50 x
scale 2 in. = 50 mi.
10 in. =
2 10 cross multiply 2x = 500
— = – x = 250
50 x
scale 2 in. = 50 mi.
9.2 in. =
2 9.2 cross multiply 2x = 460
— = – x = 230
50 x
scale 2 in. = 50 mi.
1 1/2 in. =
2 1.5 cross multiply 2x = 75
— = – x = 37.5
50 x
scale 2 in. = 50 mi.
15 1/2 in. =
2 15.5 cross multiply 2x = 775
— = – x = 387.5
50 x
find the gross pay for 39 hours at $8.17 per hour.
8.17 x 39 = $318.63
find the cost of twelve $1,000 bonds at a quotation of 84.50.
$1,000 x .845 = $845
$845 x 12 = $10,140
find the simple interest on $500 at 6% for 1 year.
i = prt i = $500 x .06 x 1 i = $30
find the life insurance premium on $20,000 at $28.14 per $1,000.
divide the 20,000 by 1,000 giving you 20.
$28.14 x 20 = $562.80
find the fire insurance premium on a $75,000 house at a rate of $.96 per $100.
divide the 75,000 by 100 giving you 750.
750 x .96 = $720
find the mean of 13, 25, 16, 52, 9.
add 13, 25, 16, 52, 9 to get 115. divide 115 by 5 = 23
find the length of the radius in a circle if the diameter is 10 ft.
the radius is 1/2 the diameter, so the radius is 5 ft.
find the median of 14, 12, 9, 7, 12, 11, 6, 7.
6, 7, 7, 9, 11, 12, 12, 14
9 & 11 are the middle numbers, so add them & divide by 2. 9 + 11 = 20 20/2 = 10
find the mode of 93, 87, 90, 74, 77, 95, 88, 81, 90
90 is the only one that appears more than once.