The sum will be:
sigma(i = 1 to infinity, 30*(2/5)^i)
->

Which is equal to 30/(3/5) = 50
Answer:
2(4+x)
Step-by-step explanation:
"Twice the sum of" tells us it will be the equation times two
"the sum of four and a number" is easy, thats 4 + x
The second number is x because the number is not specified so we need a place holder, x in this case, to tell us that the number is not given.
All this put together = twice the sum of four and a number, or <u>2(4+x)</u>
So close! But instead of adding the multiplication sign after the number you need to add them before. Good job though! :)
Aos= -b/2a so plunin your numbers and you'll get the AOS so you can find the vertex
Answer:
The answer is B or 8
Step-by-step explanation: