C + 3d = 4.10.....multiply by -2
2c + 2d = 4.60
----------------
-2c - 6d = - 8.20 (result of multiplying by -2)
2c + 2d = 4.60
-----------------add
-4d = - 3.60
d = -3.60 / -4
d = 0.90 <==== cost of 1 doughnut
c + 3d = 4.10
c + 3(0.90) = 4.10
c + 2.70 = 4.10
c = 4.10 - 2.70
c = 1.40 <==== cost of 1 coffee
Answer: -7/9
Step-by-step explanation:
<u>10-3</u>
1-10
Answer:
14.065
Step-by-step explanation:
First you wanna transfer it from kilometers to miles.
if 1 mile is = to 1.6 kilometers that is the same as saying
1/1.6, but because we are using 90 we plug it in and it becomes: 90/1.6 which gives you 56.25.
now we know we are going 56.25 miles per hour and because we are traveling 4 hours divide the miles per hour by 4 and you get 14.065.
Answer:
See below.
Step-by-step explanation:
The model may have the scale written somewhere. Try looking for it.
If you can't find it, then you can calculate this way.
Search online for the real motorcycle's length.
Then divide the scale model's length, 18 inches, by the real length. Express that as a ratio. That is the scale.
Let's say the length of a real motorcycle of this type is 90 inches.
Divide 18 inches by 90 inches.
18/90 = 1/5
The scale, then, is 1:5.
