9514 1404 393
Answer:
1200 ounces
Step-by-step explanation:
Let x represent the weight of 30% copper that needs to be added to the mix. Then the total weight will be (600+x) ounces, and the amount of copper in the mix is ...
0.30x +0.60(600) = 0.40(600 +x)
0.3x +360 = 240 +0.4x . . . . . simplify
120 = 0.1x . . . . . . . . . . . . . subtract 0.3x+240
1200 = x . . . . . . . . . . multiply by 10
1200 ounces of 30% copper should be added to the mix.
It will be 125 miles and the price will be $75.75.
5. 53.96 - 19.99 = 33.97
33.97 / 53.96 = 0.629 = 63%
6. a 62% discount means she would pay 38% of the original price
2.15 * 0.38 = 0.82 . the 0.82 is not the discount, but the amount she would actually pay.
to check: the discount is 62% 2.15 x 0.62 = 1.33
2.15 - 1.33 = 0.82
Note absolutely sure on part 7
7. A) the number of votes per vertical line is missing.
B) darken the vertical lines and total the number of colored squares there are then divide the number the winner got by total so 6/16 = 0.375 = 37.5% MAY NEED TO ROUND TO 38%
C) amber got 2/16 squares = 0.125. 420 * 0.125 = 52.5 = 53 votes
Answer:
car covers distance of 450 km in 4hr and 30min
4hr and 30 min - (4*60)+ 30 equal to 270
distance covered by car in one minute equal to 450/270 equal to 1.6 km
speed of car equal to (1.6*60)/60 equal to 1.6 km /hr
The answer is d you have to divide 54÷3 that equals 18 so you multiply that by 7
