3 years ago

sum of the 5th and 10th terms of an arithmetic sequence which are equal to the 20th term (80). find the 30th term

Mathematics

1 answer:

inysia [295]3 years ago

8 0

Yo sup??

a5=a+4d

a10=a+9d

a20=80=a+19d

a+4d+a+9d=a+19d

a=6d

80=6d+19d

80=25d

d=3.2

a=19.2

a30=a+29d

=19.2+92.8

=112

Hope this helps.

You might be interested in

(-6x+3)+(5x-4)<br><br> If you in the 7th grade or up you can answer this question

Otrada [13]

Answer:

-1x + -1

Step-by-step explanation:

(-6x+3)+(5x-4)

-1x + -1

7 0

3 years ago

Suppose you earn $7.25 per hour working part-time for a florist. Write and solve an inequality to find how many full hours you m

svlad2 [7]

$h-number\ of\ the\ full\ hours\\\\7.25h\geq125\ \ \ \ \ |divide\ both\ sides\ by\ 7.25\\\\h\geq\frac{125}{7.25}\\\\h\geq\frac{12500}{725}\\\\h\geq\frac{500}{29}\\\\h\geq17\frac{7}{29}\\\\Answer:You\ must\ work\ at\ least\ 18\ hours.$

7 0

3 years ago

Read 2 more answers

Carla uses a compass and straightedge to construct perpendicular lines. Daryl uses technology to construct perpendicular lines.

devlian [24]

They can be different because Daryl is doing it online so he will not have to swing arcs on the computer screen he will just use circles. Hope that this helps!

∪⊂⊃⊆⊇∩

6 0

2 years ago

The number of widgets that a manufacturing plant can produce varies jointly as the number of workers and the time that they have

stepladder [879]

Answer:

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

(40/5)-7+2? I know the answer but I don’t know how I got to it

ExtremeBDS [4]

Answer: