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MATH homework need help?

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please help me with my homework..10 point for best answer

1.Mario and Maria each earn $10 and hour at their summer jobs. if mario workds 3 3/4 hours and maria works 1 1/2 hours. How much did they make together??

2.The raiders won 2/5 games over the last two seasons.if they play 40 games in the last two seasons, how many did they win?

3.simplify (8x10^7)x(5x10^6)

4.the area of a circle is 16 pie. what is the diameter of the circle?

5.five people equally share 2/3 of a pizza.as a fraction, what percentage does each person get of the whole pizza?

THANKs!

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  1. 1. 3 3/4 hrs@ $10/hr

    =3.75 X 10, =37.50

    1 1/2 hrs@10/hr

    =1.5 X 10, =15

    Total=37.50 + 15.00, =52.50

    2.2/5 of 40=2/5 X 40, =16

    3.(8x10^7) X (5x10^6)

    =8 X 5 X10^7 X 10^6

    =40x10^13

    =4 X 10^1 X 10^13

    =4x10^14

    4. Area=(pi)R^2

    16(pi)=(pi)R^2

    (16)(pi)/(pi)=R^2

    4=R

    Therefore 8=D, since the diameter is twice the radius

    5. The whole pizza is 100%

    2/3 is 2/3 X 100, =66.67%

    That 66.67% is divided 5 ways

    66.67/5=13..33%

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