![cr22estiles](/avatars/38813.jpg)
cr22estiles
18.11.2019 •
Mathematics
Find s10 for -1 + -7 + -13 + -19
i would greatly appreciate if you could give me the formula and do a step by step so i can use this as an example to me with my other
Solved
Show answers
More tips
- S Science and Technology When do we change our clocks?...
- A Animals and plants How to Teach Your Parrot to Talk?...
- F Family and Home How to Remove Fading from Clothes: Tips and Tricks...
- F Food and Cooking How to Make Polendwitsa at Home?...
- F Family and Home Parents or Environment: Who Has the Most Influence on a Child s Upbringing?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- L Leisure and Entertainment How to Choose the Perfect Gift for Men on February 23rd?...
- H Health and Medicine How to Treat Whooping Cough in Children?...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
Answers on questions: Mathematics
- M Mathematics triangle PQR with P(1,5) Q(6,7) and R(4,2) is mapped onto triangle P’Q’R’ with vertices P’(3,-3) Q’(8,-1) R’(6,-6). Which vector is used in the translation?...
- M Mathematics What is the GCF of 6x^2y -9xy/12y?...
- M Mathematics K H 56 50 1. MARC est un parallélogramme tel que MCA = 67°, CAM = 23° et CA = 5,4 cm. Construire en vraie gran- deur ce parallélogramme. 2. Le parallelogramme MARC...
- M Mathematics 7.8.9 va rog ajutați ma...
- M Mathematics What is equivalent to 3(x + 2)...
- M Mathematics If j = 8 and k = 32, what does 2j + k equal?...
- M Mathematics Is (0, 2) a solution to the equation y = 7x?...
- M Mathematics Solving linear equations -12y = 108...
- M Mathematics PLSSS HELP ASAP!!! Using the given picture, determine which 2 lines are parallel and which theorem proves it. Select 3 correct answers -a -b -c -d -corresponding...
- M Mathematics Whats 2 + 2 i thought it was fish...
Ответ:
now we are going to find the 10th term
an = a1 + (n-1)*d <== formula for finding any term in arithmetic series
a1 = 1st term, d = common difference, n = term we want to find
now we sub
a10 = -1 + (10 -1) * -6
a10 = -1 + (9 * -6)
a10 = -1 - 54
a10 = - 55
now we will find the sum
Sn = (n (a1+ an)) / 2 <== formula for finding the sum
S10 = (10(-1 - 55))/2
S10 = (10(-56) / 2
S10 = -560/2
S10 = - 280
so the sum of the first 10 numbers is -280
Ответ: