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

can someone please. I forgot everything

Two-year-old sasha is exuberant and curious. all breakable items have been removed from her reach and all floor-level kitchen cabinets have been locked with the

Read the list: Their, they’r, there How are these words related? A: They are all pronouns B: They sound always alike but have different meanings C: They are

Fractions with the same numerical value or that are equal to each other are called _____. mixed fractions simplified fractions equivalent fractions parallel fr

which of the following describes a relationship of predator-prey

When must a hippa breach be reported to the us computer emergency readiness team?

Planets move around the sun in elliptical orbits. True. False

Which type of goods and/or services are typically provided by government? A) the very expensive goods and services B) the things the public wants the most C) th

what can a bat do in the dark

Complete this paragraph about the age of exploration by correctly filling in the missing information