1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olga2289 [7]
3 years ago
5

2. The sum of the third and the seventh terms

Mathematics
1 answer:
Sonja [21]3 years ago
5 0

Step-by-step explanation:

a3+a7=6

a+2d+a+6d=6

2a+8d=6

a+4d=3..... (1)

a+2d)(a+6d)=8

(3-4d+2d)(3-4d+6d)=8

(3-2d)(3+2d)=8

9-4d^2=8

d=1/2

a=1

s16=n/2 [2a+(n-1) d]

=8 (2+15/2)

=8×19/2

=76

You might be interested in
HELP PLEASE!!!!
Stels [109]

-9 is the answer

your welcome

5 0
3 years ago
A store sells rope by the meter. The equation p=0.8L represents the price p(in dollars) of a piece of nylon rope that is L meter
Margaret [11]

Answer:

1. $0.80 or 80 cents

2. 1.25 meters

Step-by-step explanation:

The equation p=0.8L represents the price p (in dollars) of a piece of nylon rope that is L meters long.

1. To find how much the nylon costs per meter, take L = 1 (this means you are calculating the price of a piece of nylon rope that is 1 meter long):

L=1,\\ \\p=\$0.8\cdot 1=\$0.80

2. To find how long a piece of nylon rope that costs $1.00 is, substitute into the equation p = 1:

p=1,\\ \\1=0.8L\\ \\L=\dfrac{1}{0.8}=\dfrac{10}{8}=\dfrac{5}{4}=1.25\ meters

5 0
3 years ago
Evaluate 5x3 - 21 + 7 when x = -2.
Sliva [168]

Answer:

26

Step-by-step explanation:

5x³ - 21 + 7

x = 2

then:

5x³ - 14

5*2³ -14

5*8 - 14

40 - 14

26

8 0
3 years ago
Read 2 more answers
A bag of rice has a mass of 3.18 pounds. Find its mass in kilograms
Paha777 [63]
1 pound = 0.453592 Kilograms
Mass of the rice in pounds = 3.18 pounds
3.18 pounds = (3.18*0.453592) Kilograms
                     = 1.442424 Kilograms
The mass of the rice in kilograms is 1.442424 Kilograms.
7 0
3 years ago
Seven - twelfths of a new dress has been sewn. Chelsea did 3/7 of the sewing. How much of the dress did Chelsea sew?
galina1969 [7]
1/4, because 7/12×3/7=1/4
7 0
3 years ago
Other questions:
  • What sequence is geometric and has 1/4 as it's fifth term and 1/2 as the common ratio?
    9·1 answer
  • Find the equation of the line. <br> Use exact numbers
    5·1 answer
  • LMN is a right a right angle triangle angle NLM is 90 degrees PQ is parallel to LM. Area of triangle PNQ is 8cm and area of tria
    14·1 answer
  • If y= -cos x, what x-value corresponds to a y-value of 1 between 0 and 2 pi
    7·1 answer
  • a counter top is in the shape of a trapizoid . the lengths of the base is 70 1/2 and 65 1/2 inches long. the area of the counter
    12·1 answer
  • a battery company manufactures batteries having life spans that are normally distributed, with a mean of 45 months and a standar
    9·2 answers
  • Infiniti sells 8 different models of cars, with 5 different trim levels and 5 color choices. What is the total amount of options
    9·1 answer
  • Help plsssssssssssssssssssssssssssssssssssssssssssss!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    15·1 answer
  • Find the mean and median of the data set.
    5·2 answers
  • Solve 14a-3b+9c=18 for a. Do not use a= in your answer
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!