Label your unknown numbers
I'm calling them x and y
x+y=21
5x+2y=66
find a relation of x and y
y=21-x
substitute this into your second equation
5x+2 (21-x)=66
simplify to find x
5x+42-2x=66
3x+42=66
3x=24
x=24/3=8
apply your findings to find the second number
8+y=21
y=13
check your answer
5 (8)+2 (13)=66
40+26=66
we now know that the first number x is 8
and the second number y is 13
Answer:
Tyler should buy 2 goldfishes for his fish tank,
Step-by-step explanation:
First let's find the volume of the sphere, using the following equation:
The radius is half the diameter, so the radius is 14/2 = 7 inches
Now, finding the volume, we have:
Now, we know that we need to have 1 goldfish for every 693 in3 of water, so to find the number of goldfishes, we just need to divide the volume of the sphere by 693 (and round down the result if needed):
Tyler should buy 2 goldfishes for his fish tank,
Answer:
c
Step-by-step explanation:
hope it works
Answer: A3. The counting principle lets
you multiply
<span>The fundamental
counting principle is a method for determining how many ways that a combination
of events can occur. For example, if the
first event can occur 2 ways, the second event can occur 3 ways, and the third
event can occur 4 ways, then you can find out the number of unique combinations
by multiplying: 2 * 3 * 4 = 24 unique combinations.</span>
<span>This
multiplication method works any time you have several options or criteria like color,
shape, and design and each of those factors can be combined with each other in
any way possible. </span>
Answer:
number 4 is $223.6 (ADD THE MONEY SYMBOL TOO)
Step-by-step explanation:
44.72 = tip + money she gets per unit of time
then 44.72 x 5 because 5 is how many hours and 44.72 is how much she gets an hour