9 × 9 = 81
9 plus itself 9 times equals 81
the nines table goes 9,18,27,36,45,54,63,72,81,90
To check the two numbers add up to 9 for 1-10 multiples
Algebra would be m × m =m^2
^means to the power and the 2 means we are doing it to the power of two [Also known as squaring]
This works because they are both the same number
Answer:
255 were laptops.
Step-by-step explanation:
If 75% of the computers sold are laptops, you'd multiply the total amount of computers sold (340) times the percentage (75% = .75).
So, 340 x .75 = 255.
Answer:
(4, 0)
Step-by-step explanation:
3x + 4y = 12
2x - y = 8
8x - 4y = 32
11x = 44
x = 4
y = 0
Answer:
c (2,3,-2)
Step-by-step explanation:
3x+y+z = 7
x+3y-z =13
y = 2x-1
Add the first two equations together to eliminate z
3x+y+z = 7
x+3y-z =13
----------------------
4x+4y = 20
Divide by 4
4x/4 + 4y/4 = 20/4
x+y = 5
We know y = 2x-1. substitute this into the equation
x+ (2x-1) = 5
Combine like terms
3x-1 =5
Add 1 to each side
3x-1+1 =5+1
3x=6
Divide by 3
3x/3 = 6/3
x=2
Now we can find y
y = 2x-1
y = 2(2)-1
y =4-1
y= 3
We know x and y, now we need to find z
3x+y+z = 7
3(2) +3 +z = 7
6+3+z =7
9+z=7
Subtract 9 from each side
(-9+z =7-9
z=-2
So x=2,y=3 =-2
(2,3,-2)
