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
ladessa [460]
3 years ago
7

find the sum of the first 20 terms of an arithmetic sequence with a first term of -14 and a comman difference of 4​

Mathematics
1 answer:
timama [110]3 years ago
7 0

Answer:

480

Step-by-step explanation:

Sn = n÷2 × (2a + (n-1)d)

n = 20 a = -14 d = 4

S20 = 10 × (-28 + 19 × 4) = 480

You might be interested in
a bank receives a initial deposit of 9,000, kept a percentage of 9% and loaned out the rest. The loan was paid back. If this cyc
SSSSS [86.1K]
9000/0.09=100000 ...................
3 0
3 years ago
A parachutist descends 44 feet in 4 seconds. Express the rate of the parachutist's change in height as a unit rate.
Montano1993 [528]

The unit rate of the parachutist change in height is 11 feet per second.

   • In Mathematics, Unitary method is a technique for solving a question by first finding the value of a single unit and then finding the required value by multiplying the number by value of single unit .

   • We use unitary method to find the ratio of one thing with respect to other thing.

   • There are two types of unitary method one is Direct Variation and the other is Inverse variation.

We have the rate of descend as 44 feet in 4 sec.

So, in 1 second it will be = 44 / 4 = 11 feet.

Which is the unit rate.

Therefore, the unit rate of descend for the parachutist is 11 feet per second.

Learn more about unit rate here:

brainly.com/question/19493296

#SPJ9

5 0
1 year ago
A quadrilateral has angles that measure 101°, 133°, and 76°.
Andrews [41]
The last angle is 50°
4 0
2 years ago
Who built Cape Coast Castle ​
lana [24]

Answer:

Swedish Africa Company

4 0
2 years ago
What power of 10 is used to write the number
Anastasy [175]

Answer: Seventh power of 10


Step-by-step explanation:

X > 1 so exponent will be positive and decimal point moves left. At each point divide X by 10, add 1 to exponent of 10. Exponent starts at zero.


Each time you move the decimal point one to left, you have divided the number by 10, so you have to compensate by multiplying the 10^n factor by 10, say 10 × 10^3 = 10×10×10×10 = 10^4.


12345678 = 12345678 × 10^0

= 1234567.8 × 10^1

= 123456.78 × 10^2

= 12345.678 × 10^3

= 1234.5678 × 10^4

= 123.45678 × 10^5

= 12.345678 × 10^6

= 1.2345678 × 10^7


Each time you move decimal to right, you have multiplied the number by 10, so you have to compensate by dividing the 10^n by 10, subtracting one from exponent.


0.000123 × 10^0 = 0.00123 × 10^-1

= 0.0123 × 10^-2 = 0.123 × 10^-3 = 1.23 × 10^-4


10^-2 / 10 = (1/(10×10)) / 10 = 1/(10×10×10) = 10^-3

6 0
3 years ago
Other questions:
  • Number line for-5 c <-30 the sign also has a line under it
    5·1 answer
  • Simplify and write 0.6752 x 104 in scientific notation
    12·1 answer
  • Which fraction would make this equation true 5×?=6 1/4​
    8·1 answer
  • This is a better photo I can’t figure this one out. Any help?
    8·2 answers
  • Hii please help i’ll give brainliest
    11·1 answer
  • A boy is shopping at a sports store. He has $11 with which he wants to buy a t-shirt and some tennis
    15·2 answers
  • Suppose the local Barons team wins every game they play with a probability of 0.75. What is the probability that the Barons woul
    15·1 answer
  • The round-trip distance between Tampa, Florida and New Orleans, Louisiana is 944 miles. A truck driver has made the round trip b
    13·1 answer
  • A map is drawn using a scale of 40 kilometers to 1 centimeter. The distance between two cities is 300 kilometers. How far apart
    15·1 answer
  • To get from his house to the lecture hall at school, Lin walked west 651 feet. After class, he walked northeast 910 feet to the
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!