C = -4 that’s the answer if you didn’t see my comment
1 x 20
2 x 10
4 x 5 (these go the other way round as well, like 10 x 2, etc)
all factors of 20 = 1,2,4,5,10,20
hope this helps!
One of the multiples would be 84. It is pretty easy you just have to times 7 by numbers higher than 12 until you'll get to the maximum number before 90.
(4*4*10)*3
160*3=480
(5*3*10)*2
150*2=300
480+300=780 cub. meters
Answer:
100
Step-by-step explanation:
To complete the square, you have to add ()² to each side.
So, -20 divided by 2 is -10. -10 squared is 100, so add 100 to both sides of the equation to complete the square.