review math

spends 1/5 income has 4/5 income left 5/5-1/5=4/5 (remainder)

spends 3/8 4/5×3/8=12/40=3/10 (salaries)

d=20 so r=10 π(10)^2=100π

d=18 so r=9 π(9)^2=81π 100π-81π=19π

0.40×20=0.20x 0.40×20/0.20=x

x=40

x+3>5 x+3>5 x+3-3>5-3

x>2 4+3>5 7>5

50+50=100°

180-100=80°

$55,000×80% $55,000×0.8=$44,000

$44,000÷10=440 $4.74×440=$2,085.60

$6,000×0.05=$300.00 (income) $900-$300=$600 (additional interest) $600=0.06 times x

$600=0.06x $600.00/0.06=(0.06/0.06)x x=$10,000 (new amount needed)

8 pts=1 gal $3.84÷8=$0.48

3 pts $0.48×3=$1.44

two digits to the right of the decimal point

3,191.79

1lb=16oz 2,200×16=35,200

40oz to 35,200 oz 35,200÷40=880

4l length of one side

4×5=20 cm

2 1/2/2=1/2/x or 5/2/2=1/2/x 5/2÷2/1=5/2×1/2=5/4 1/2÷x/1=1/2×1/x=1/2x

5/4=1/2x or 10x=4 10x=4 x=4/10=2/5 corn syrup

100/20=5 5 stories=20%

5×5=25

8 hrs 8:45 am-4:45 pm 5:15 is 1/2 hr subtract 1 hr 8 1/2-1=7 1/2 or 7.5

7.5×$7.50=$56.25

2x^2-3x+10 =2 (-7)^2-3(-7)+10 =2(-7)(-7)-3 (-7)+10

=2(49)-3(-7)+10 =98+21+10 =129

25%->1/4 $400×1/4=$100 (first reduction) $400-$100=300 (weekend sale price)

10%=0.1 $300×0.1=$30 ( second reduction) $300-$30=$270 (cash price)

0.675/0.9=6.75/9

0.75