2 answers:
Answer:315
Step-by-step explanation: Just put -21 x(-15) in your calculator
Answer:
315
Step-by-step explanation:
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81, if you mean 9 Squared.
Answer:

Step-by-step explanation:

I hope this helps you
1)
x= -2y
2. (-2y)+4y=0
0=0
2)
x+2x= -3
x=-1
y= -2
3)
7x+2x+2=4
9x=2
x=2/9
y=2/9+1
y=11/9
There are 18 cows and 16 chickens.
Answer:
2: 2, 4, 6, 8, 10
5: 5, 10
lcm: 10