8th grade math help?

Question

1] the legend on the united states mapreads .50 inch= 25 miles

how many miles apart are two cities wich are 5 inches apart on the map?

a)75miles b)150miles C)200miles d)250miles

2] candy bars are on sale.scott has enough money to buy 4 bars,but not 5. if scott has 3 qourters,1 dime,and 1 nickle,what is the possible price range of the bars?

a)17 to 20cents b)18 to 21cents c)19 to 22cents d)23 to 25cents

3]write numeral power of ten.Find .0001=10 to the power of what?

4] these are 2/3 total set of stars. how many more do i need to draw to make 100%?? there are 8 stars drawn already how many more

a) 1 b) 2 c) 3 d) 4

5] find the surface area of the cylinder to the nearest whole number

the hight is 10in. the radius 20in

Answer 1

5 inches = 10 25 miles so d

the amount of cash he has is 90 cents. and he can buy 4 so that would make each bar 22.50 if all are even. now multiply all the lowest values and highest by 4 to see which gets closest (or use logic). 17 x 4= 68 20 x 4 =80. the other answers are (72 and 84) (76 and 88) (92 and 100). its obviously not D. now see which ones can be 5. (85 and 100) (90 and 105) (95 an 110) well the first 2 you can get 5 so they lose. the answer is C

10^-4 since that is 1/10000. check out rules for negative exponents on line

8 / 2/3 = 12. this means that 8 is 2/3 of 12. so 4 left

surface area = 2(pi)r^2 + 2(pi)rh

this works out to be 800(pi) + 400(pie) so its 1200(pi). normally higher level math doesn't solve for pi. but i guess 8th grade does so its 3770 rounded

Answer 2

this is easy stuff. why do u need help? or do u just want an easy way out to get answers? are u sure this is 8th grade cuz i did this when i was in 6th grade

Answer 3

1)

0.5 Inch = 25 miles

5 inch = 250 miles

Ans D is correct

2)

total money = 75+10+5 = 90 cents

Ans C

because with 22 cents price you cannot have 5 and with 19 cents price you can have 4 bars

3)

10^-4 power of -4

4)

5)

surface area = PI*r*r*H

(22/7)*20*20*10

solve and get the answer

Answer 4

1] the two cities are 10 "legends" apart since 5 / 0.5 = 10

In the real world the 2 cities will be 10  "legends" * 25 = 250 miles.

2] Scott has 90 units.

The maximum for a bar is 22.5 units.

Since 90 units cannot buy 5 bars or 18 units/bar

then bars are between 19 and 22.5 units.

(if half units are accepted, then between 18.5 and 22.5 units.

3] 1 is 10 ^0

0.1 is 10 ^-1

0.01 is 10^-2

0.001 is 10^-3

0.0001 is 10^-4

Answer 5

anything else?