Comment
There are 4 terms in this series
That's because the summation (Sigma) goes from 3 to 6 inclusive. So k takes on values of 3,4,5,6
You could use this summation formula
Formula
Sum = (a + L)n/2
Substitution
a is the first term.
k = 3 for the first term
a = -5k + 20
a = -5(3) + 20
a = -15 + 20
a = 5
For the last term k = 6
L = -5(6) + 20
L = -30 + 20
L = - 10
Sum
Sum = (5 - 10)*4/2
Sum = -5 * 2
Sum = -10
Comment
You may wonder how come the last term and the sum are the same. The reason to be found by figuring out the 4 terms and adding them together.
When k = 3, -5k + 20 = -15 + 20 = 5
When k = 4, -5k + 20 = -20 + 20 = 0
When k = 5, -5k + 20 = -25 + 20 = -5
When k = 6, -5k + 20 = -30 + 20 = -10
Sum = 5 + 0 - 5 - 10 = - 10
Conclusion.
It is an accident of the numbers.
Answer: - 10 = the Sum
Answer:
no
Step-by-step explanation:
ok
Answer:
the fourth number would be 9
Step-by-step explanation:
the last number would be 9 because if you know the mean is 7 and there are 4 numbers then you multiply 4*7 then subtract 5, 7 and 7 to get 9
Answer: D
Step-by-step explanation:
1875/250
= 7.5
total combined weight/amount of cats
= mean
Answer and step-by-step explanation:
Tim Carter money made:
First 40 hours = 40 * pay per hour = 40 * 5.15 = $206 (weekly pay)
Because he works for 50 hours so next 10 hours (50-40) = 10 * (1.5*5.15)
= 10* 7.725 = $77.25
Total money he made:
= 206 + 77.25 = $283.25
Jeese Jones money amde:
First 40 hours = 40 * pay per hour = 40 * 5.15 = $206 (weekly pay)
Because he works for 47.5 hours so next 7.5 hours (47.5-40) = 7.5 * (1.5*5.15)
= 7.5 *7.725 = $57.9375
Total money Jeese Jones made:
= 206 + 57.9375 = $263.9375
Barbara Burns money made:
First 40 hours = 40 * pay per hour = 40 * 5.15 = $206 (weekly pay)
Because Barbara Burns works for 44 hours so next 4 hours (44-40) = 4 * (1.5*5.15)
= 4* 7.725 = $30.9
Total money Barbara Burns made:
= 206 + 30.9 = $236.9
Hope this help you :3
