Answer:57+51+3
Step-by-step explanation: use https://www.cymath.com/
Answer:
x = 9, x = -9
alternatively:
x = {9, -9}
Step-by-step explanation:
how absolute value works is you split it into 2 equations:
9x = 81, and 9x = -81
9x = 81
x = 81/9
x = 9
9x = -81
x = -81/9
x = -9
Answer:
x+2y=-7
Step-by-step explanation:
2y + x =-7
x+2y=-7
Answer:
Mean = $123
Standard deviation = 10190
Variance = 1698
Step-by-step explanation:
Mean=?
= sum of all numbers/ Total numbers
a = 93+173+107+125+56+163+144 / 7 = 861/7 = $123
Standard deviation=?
we know that = Sqareroot [ Sum (y)²] / N
we need deviation:
= x-a = y ; y²
= 93-123 = -30 ; 900
=173-123 = 50 ; 2500
=107-123 = -16 ; 256
=125-123 = 2 ; 4
=56-123 = -67 ; 4489
=163-123 = 40 ; 1600
<u> =144-123 = 21 ; 441</u>
Sum of y² = 10190.
= Square root [ 10190 / 7 ]
= 38.1
Variance = ?
= Sum ( y)² / N-1
= 10190 / ( 7-1)
= 10190 /6
= 1698