Do you know. How to solve these?
2 answers:
B, e, and c
this is how you can tell
b: 7/2, both the top and bottom × 3 will get 21/6, 7×3=21, 2×3=6 so they are proportional
e: both 5 and 2 multiply 5: 5×5=25, 2×5=10, so 25/10 is proportional to 5/2
c 4×3=12, 5×3=15
the others are not.
another way to do it is what I call 'diagonal times'. for example;
, you multiply diagonally, 5×11=55, 6×9=54, 55 and 54 are not equal, so they two fractions are not proportional.
try this "diagonal times" on b, c, e, you'll see you get two products that are equal.
this is how you can tell
b: 7/2, both the top and bottom × 3 will get 21/6, 7×3=21, 2×3=6 so they are proportional
e: both 5 and 2 multiply 5: 5×5=25, 2×5=10, so 25/10 is proportional to 5/2
c 4×3=12, 5×3=15
the others are not.
another way to do it is what I call 'diagonal times'. for example;
try this "diagonal times" on b, c, e, you'll see you get two products that are equal.
You might be interested in
Answer:
2 hours
Step-by-step explanation:
Given : The distance between New York City, NY, and Louisville, KY is 720 miles. One morning a train traveling 80 mph left from New York. Two hours later a slower train, traveling at 60 mph, left Louisville.
To find : How many hours will the slower train travel for before both trains will arrive at the same point?
Solution : Let the distance covered by NY is x
and let the distance covered by KY is y
Total distance covered is ........[1]
→ New York city,
Distance traveled = x
Speed of the train = 80 mph
Time taken = t+2
Formula is
.......[2]
→ Louisville,
Distance traveled = y
Speed of the train = 60 mph
Time taken = t
Formula is
.......[3]
Put the value of t from [3] into [2]
......[4]
Now, we solve equation [1] and [4],
Put the value of y from [1] and put back in [4],
Put x=480 in [1]
So, The distance covered by train from New York city is x=480 miles
The distance covered by train from Louisville is y=240 miles.
Now put value of y in [3] to get time,
So, The time taken by train from Louisville is 4 hr.
The time taken by train from New York city is t+2=4+2=6 hr.
→ 6-4=2 hours will the slower train travel for before both trains will arrive at the same point.