It is an arithmetic progression. Note the general rule for AP sequences:
a(n) = a(1) + (n - 1)d
a(1) = 12a (first term)
d = 3a (common difference)
General rule: a(n) = 12a + (n - 1)*3a
4 x (3.4 + 2) - (56/7) is 13.6
Yes this is so because 2is composite, but it is a multiple of 4,6,8,10...
Answer:
y ≤ q 0 or y ≥ 16.
Step-by-step explanation:
Rearrange unknown terms to the left side of the equation: |y - 8| ≥ q 19
Answer:
Time machine one = 3.56
Time machine two = 4.56
Step-by-step explanation:
Let machine 2 do the job in x hours
Let machine 1 do the job in x - 1 hours.
The general formula for this problem is
Time = A*B/(A + B)
Givens
Time = 2 hours
B = x hours alone
A = x - 1 hours alone.
#################
x *( x - 1)
======= = 2
(x + x - 1)
(x^2 - x)/(2x - 1) = 2
x^2 - x = 2(2x - 1)
x^2 - x = 4x - 2
x^2 - 5x + 2 = 0
a = 1
b = - 5
c = 2
This gives 2 roots
x = 4.56
x = 0.43
The second root will not work because when 1 is subtracted from 0.43 the time give will be minus, which won't work.
Time for machine 2 is 4.56
The time for machine 1 is 3.56
Check
(A * B)/(A + B) = 2
A = 4.56
B = 3.56
Time = 4.56*3.56/(4.56 + 3.56)
Time = 16.2336/(8.12)
Time = 1.9992
The rounding error in the check comes from the rounding error in the times.
