calculate 3^(n-1) n(n+1)/2 = 40824
Calculate: 1 × 3 + 2 × 4 + 3 × 5 + … + 51 × 53 = …
x/8 + 5/2 =y
11+y/3y=3
4
432
X
1000
100
=
3
x
x-3y-3y(x-2y)-(-4x+7y)
271*3
√t+3/√t=2
Simplify the following expression: x - (2y + 3x) -2y
how many square millimetres equal a square centimetre
-10-(+7) using number line
