Find s25 for -7+ -2 + 3 + 8 +…

the 25 is below the idk how to type that

need asap! !

We know S(n) = n/2 [ 2a + (n-1)d ]
Here, n = 25
a = -7
d = -2-(-7) = -2+7 = 5

Substitute their values, 
S(25) = 25/2 [2(-7) + (25-1)5 ]
S(25) = 25/2 [-14 + 120 ]
S(25) = 25/2 [106 ]
S(25) = 25 [ 53 ]
S(25) = 1325

In short, Your Answer would be 1325

Hope this helps!

2 000 000 000 (2 billion)

Step-by-step explanation:

To round to the nearest billion we take a look at the following number 234 569 000, in this case we have 2 hundred millions which is less than 500 million (minimum value to round up to 3 billion) so in this case we round this number to 2 billion.

Let's take another example to see when to round up: 2 534 569 000 would be rounded to 3 billion for example.