I need help with these math problems.?

1. The power output of a nuclear reactor is 2.4 x 107 watts. Which number expresses the same value in standard notation?


A.


2,400,000 watts





B.


9,400,000 watts





C.


16,800,000 watts





D.


24,000,000 watts





4. Three-fifths of a city's population is registered to vote. In the last election, 75% of the registered voters cast a ballot. What fractional part of the city's population voted in the last election?


A. 9/20





B. 3/4





C. 4/5





D. 27/20


5. Jerry is planning to buy a stereo system priced at $840 through an installment plan. This plan requires a down payment of $190 and 24 monthly payments of $32.35. How much more will Jerry pay for the stereo system by using the installment plan rather than paying cash?





A.


$63.60





B.


$126.40





C.


$253.60





D.


$ 650.00





8. At the beginning of the summer, Katie opened a new checking account with a $60 deposit. Each week during the summer, she earned $95 as a part-time lifeguard. Katie deposited 10% of these earnings into her account. Which of these equations represents the amount of money, m, Katie will have deposited in her checking account after w weeks?


A.


m = 15.5w





B.


m = w + 69.5





C.


m = 95w + 60





D.


m = 9.5w + 60





10. Which equation is equivalent to 3(2x - 5) = 4(x + 3)?


A.


2x = -27





B.


2x = 27





C.


10x = -27





D.


10x = -3





12. Susan entered a highway at 1:00. On the highway, she had driven a total of 32 miles by 1:30, 61 miles by 2:00, and 125 miles by 3:00. Which kind of data display would be an appropriate way to show how Susan's total driving distance varied with time?





A.


line graph





B.


circle graph





C.


stem-and-leaf plot





D.


box-and-whisker plot














|||1) D. 2.4E7 = 24,000,000 watts





4) Three-fifths of a city's population is registered to vote. In the last election, 75% of the registered voters cast a ballot. What fractional part of the city's population voted


3/5 * 3/4 =


A. 9/20





5.) (190 + 24*32.25) - 840 = ? , you do the rest.





8)


$60 deposit + (10% * $95 * m weeks)


Well obviously due to the $60 it can only be C or D.


Remembering she only deposited 10% of the $95, it's


D. m = 9.5w + 60





10) Which equation is equivalent to 3(2x - 5) = 4(x + 3)?


6x-15 = 4x+12


2x = 27





B. 2x = 27





12. Susan entered a highway at 1:00. On the highway, she had driven a total of 32 miles by 1:30, 61 miles by 2:00, and 125 miles by 3:00. Which kind of data display would be an appropriate way to show how Susan's total driving distance varied with time?





A. line graph


(and not a bar chart, because her distance traveled varies constantly with time)|||1. D. 24,000,000 watts





4. A. 9/20


(3/5)(0.75)=9/20





5. B. $126.40


$190+(24x$32.35) - $840 =$126.40





8. D.m = 9.5w + 60





10. B. 2x = 27


3(2x - 5) = 4(x + 3)


6x - 15 = 4x +12


6x - 4x = 15 + 12


2x = 27





12. A. line graph|||4)


3/5 = 60% = .60


.75 x .60


= 9/20 (A)





5)


24 x $32.25 = $776.40


$776.40 + $190 = $966.40


$966.40 - $840 =


$126.40 (B)





8)


M = 9.5w + 60 (D)








|||1. D


4. A


5. B


8. D


10.B


12. i'm not too sure about graph shapes. sorry