rebekahrocha75
rebekahrocha75 rebekahrocha75
  • 09-02-2017
  • Mathematics
contestada

If −20 is the 15th term in an arithmetic sequence with a common difference of −7, what is the first term in the sequence?

Respuesta :

warblitz
warblitz warblitz
  • 09-02-2017
An=A1+(n-1)d
-20=A1+(15-1)x-7
-20=A1+14 x -7
-20=A1-98
+98     +98
-98+98=0
-20+98=78
A1=78
Answer Link

Otras preguntas

Thank you very much Can someone help me please!!!!!
a school is selling T- shirts to students. it costs $35 to create the design and $10 to print each shirt. write an equation in y=mx+b that models this.
Solve for substitution Y+5x= -3 3y-2x= 8
Responsibilities of drivers
¿Unidad que se utiliza para medir la fuerza de gravedad?a)Metrob)kilocaloríac)Newton
two angles form a linear pair. the measure of one angle is 1/4 the measure of the other angle. find the measure of each angle
the undo button is located on the ____
Life criteria Definition
how do we find the square root of a number
the first continental congress was held in 1774 in the city of: a. washington, d.c. b. new york c. philadelphia d. boston