Volume is how much something can be filled. Surface area is the surrounding area of the object. For example; the surface area of a ballon is the rubber and the volume is the air or helium.
So for variables, you just substitute the number in for the variable.
177 - 5r
If r = 9,
117 - 5 × 9
117 - 45
72
Answer:
Step-by-step explanation:
21≤2.50+5s subtract 2.50 from both sides
18.50≤5s divide by 5
s≥3.7 he can buy up to 3 bags at $5 each
Answer:
![1.6\cdot{x}](https://tex.z-dn.net/?f=1.6%5Ccdot%7Bx%7D)
Step-by-step explanation:
If the speed is constant for 5 machines and produces x amount of toys we know that rate is defined as a constant per time:
Here the machines are constant and the rate is x toys per hour:
If 5 machines make x per hour:
Rate is x/1 hour
The the ratio of 8/5 is 1.6. Therefore for 8 machines the rate is 1.6 times more per hour than for5 machines. Therefore we can write an expression as:
Rate for 5 machines is x and for 8 machines is y:
![y=1.6\cdot{x}](https://tex.z-dn.net/?f=y%3D1.6%5Ccdot%7Bx%7D)