The series 25 + 75 + 125 + ... + 775 + 825 can be written using sigma notation. Write an expression for ak in terms of k. And find n

Step-by-step explanation:

Hello,

75 - 25 = 50

125 - 75 = 50

so

Then we can write

to note that

because

-25 + 50n = 825

<=> 50n = 850

<=> n = 17

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

351.23

step-by-step explanation:

according to this law, when unemployment goes up by 1%, gdp drops by 2%. in the question, unemployment rate goes from 2% to 5%, meaning unemployment goes up by 3%, so the gdp drops by 6%. thus the effect is a drop in gdp by 6%.

step-by-step explanation: