Answer:
Step-by-step explanation:
3a-2c+5ac=a
3a- a + 5ac= 2c
2a + 5ac = 2c
a ( 2 + 5c) = 2c
a = 2c / (2+5c)
Answer:
374.4
Step-by-step explanation:
All items related to the maintenance are 20% more expensive, it means that each datum is 20% bigger including the average.
The variance its a dispersion measurof the data and its calculated of this way:
Here n is the number of data, is the average and represent each datum. The increment in 20% in each parameter can be represented multiplying for 1.2, of this way
Factorizing the 1.2 we have:
That is:
The new variance is
Answer:
45= v
Step-by-step explanation:
9 = v/5
Multiply each side by 5
9*5 = v/5*5
45 =v
√2π / √5 (expand the expression)
√2π / √5 x √5 / √5 (multiply the fractions)
√2π√5 / √5/√5 (calculate and multiply)
solution is √10π/5 so 1.98 round it to the nearest 10 and it'll be 2 so the answer is D