Answer:
See answers below.
Step-by-step explanation:
A relation is a function if the x-value in group of ordered pairs is only used one time.
1. Not a function: The x-value 4 was used twice.
2. Yes, it is a function: Each x-value was used one time.
3. Not a function: The x-value -2 was used twice.
4. Yes, it is a function: Each x-value was used one time.
5. Not a function: Each x-value -1 and -2 were used twice.
6. Not a function: The x-value 1/2 was used twice (1/2, 0) and (1/2, 1).
Since
density = mass/volume (which is just another word for size)
density of cube X = (cube X's mass) / (cube X's volume)
lets name "(cube X's mass) / (cube X's volume)" as "x"
density of cube Y = (cube Y's mass) / (cube Y's volume)
lets name "(cube Y's mass) / (cube Y's volume)" as "y"
then to calculate <u>how many times</u> is the density of cube X to density of cube Y, then it will be x/y
if calculating <u>how many times greater</u><u />, then it is (x-y)/y
though the phrase "how many times greater" can also mean "how many times".
Answer:
$153
Step-by-step explanation:
To find the total cost, we have to calculate the area of one bead, then all of them:
Area of one bead = pi x r^2 = 3.14 x 0.5^2 = 3.14 x 0.25 = 0.765cm^2
Area of 20 beads = 0.765 x 20 = 15.3cm^2
Now, we are able to calculate the ultimate cost of coating:
If the cost is $10 per cm^2, then we have to find how much it costs to coat 15.3 cm^2.
15.3 x 10 = $153.
Hope this helps