jennileebeukes9 jennileebeukes9

03-08-2021
Mathematics

contestada

S=n/2(2a+(n-1)d). If d=5, n=13, S=585 find the value of a.

Respuesta :

aayu0302 aayu0302

03-08-2021

Answer:

15

Step-by-step explanation:

Sum of 'n' terms formula is given by:-

s=n/2(2a+(n-1)d)

s=13/2[2xa+(13-1)5]

s=13/2(2xa+12x5)

s=13/2(2a+60)

585=13/2(2a+60)

585 x (2/13) = 2a + 60

90 = 2a + 60

90-60 = 2a

30 = 2a

a = 15

Answer Link

Otras preguntas

Colonel George Washington led a militia force into the Ohio Valley in 1754. What was the name of the fort that Washington built and was near the site of the fir

Which desert does the Huang river curve around

What is three equivalent fractions to 75\100

A dog toy is on sale for 20% off the original price. If the original price of the toy is $11.50 what is the discounted price?

Six grape fruit cost $5.34. How much does one grape fruit cost????

What problems existed in pre revolutionary France?

Why does photosynthesis require water? a. because water provides oxygen atoms b. because water provides electrons c. because water accepts electrons d. because

A habitat that has lots of light and water, a high elevation, low temperatures, and a low level of oxygen is most likely a _____. a. desert b. high mountain c.

both chloroplasts and mitochondria are like in that they both have inner membranes and their own blank.

Which of the following is true about scientific theories? I. New research is often done to learn more about existing scientific theories. II. Scientific theorie