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
Liula [17]
3 years ago
15

Given Sn=2n^2 - 5n, find

Mathematics
1 answer:
brilliants [131]3 years ago
6 0

Answer:

a) -3

b) 117

c) 100

Step-by-step explanation:

(a) 2(1)²-5(1)

1²= 1

2×1= 2

2-5= -3

(b) 2(9)²-5(9)

9²= 81

81×2= 162

162-45= 117

(c) 2(4)²-5(4) +2(8)²-5(4)

4²=16

16×2= 32

32-20= 12

8²=64

64×2= 128

128-40= 88

88+12= 100

hope it helps!

You might be interested in
Which statement best completes the sentence below? If the measure of /_4 is 70^o, then the measure of /_8 is _________________.
Alex_Xolod [135]

Answer:

As given, measure of angle 4 is 70°

Then what would be the measure of ∠8.

Following cases comes into consideration  

1. If ∠4 and ∠8 are supplementary angles i.e lie on same side of Transversal, then

 ∠4 + ∠8=180°

⇒70°+∠8=180°  [∠4=70°]

⇒∠8=180°-70°

⇒∠8=110°

<u>2nd possibility</u>

But if these two angles i.e ∠4 and ∠8 forms a linear pair.Then

⇒ ∠4 + ∠8=180°

⇒70°+∠8=180°  [∠4=70°]

⇒∠8=180°-70°

⇒∠8=110°

<u>3rd possibility</u>

If ∠4 and ∠8 are alternate exterior angles.

then, ∠4 = ∠8=70°

<u>4th possibility</u>

If If ∠4 and ∠8 are corresponding angles.

then, ∠4 = ∠8=70°

Out of four options given Option A[ 110° because ∠4 and ∠8 are supplementary angles], Option B[70° because ∠4 and ∠8 are alternate exterior angles.] and Option D[70° because ∠4 and ∠8 are corresponding angles.] are Correct.







8 0
3 years ago
A ​used-boat dealership buys a boat for ​$2800 and then sells it for ​$4000. What is the percent​ increase?
Rudik [331]

Answer:

Step-by-step explanation:

percent increase = increase divided by original number x 100

                           

increase is the difference between the two numbers...

new number - original number.....4000 - 2800 = 1200

percent increase = (1200 / 2800) x 100

                            = 0.42857 (round to .4286) x 100

                             = 42.86 %.....if you need it rounded to the nearest percent, it      would be 43% increase

6 0
3 years ago
What should be your first step when subtracting integers?
iris [78.8K]

Your first step when subtracting integers is (d) subtract the numbers

<h3>How to determine the first step?</h3>

The operation is given as:

Subtraction operation

Assume that the operation is a simple expression that involves subtraction, such as:

a - b

The first step is to subtract the numbers

Hence, your first step when subtracting integers is (d) subtract the numbers

Read more about subtraction at:

brainly.com/question/17301989

#SPJ1

8 0
2 years ago
Two people share £350 in the ratio 1 : 6.<br><br><br>Calculate each share.
EleoNora [17]

Answer:

£50 and £300

Step-by-step explanation:

Sum the parts of the ratio 1 + 6 = 7 parts

Divide the amount by 7 to find the value of one part of the ratio

£350 ÷ 7 = £50 ← value of 1 part of ratio

Hence

1 person receives £50

the other person receives 6 × £50 = £300

6 0
3 years ago
1.5.3 Quiz: Literal Equations and Formulas
sweet-ann [11.9K]

Answer:

c = F-32; 68-32 = 36°C.

Step-by-step explanation:

the real conversation equation is f = 9/5 C + 32. but for the sake of this problem we are ignoring the coefficient.

so it's 36°C

3 0
3 years ago
Other questions:
  • Joyce paid $220 for an item at the store that was 35 percent of the original price. What was the original price?
    7·1 answer
  • The range of set scores is found by subtracting the lowest score from the highest. The range set scores is 52, and the lowest sc
    11·1 answer
  • Find the value of X<br><br>A: 2<br>B: 4<br>C: 6<br>D: 8​
    7·1 answer
  • What is -1/4(x+8)+30=7
    9·1 answer
  • What is 5.8 × 10^6 mg/s in grams per minute?
    13·1 answer
  • Which is equivalent to One-fourth x? StartFraction 1 over 8 EndFraction x + StartFraction 1 over 8 EndFraction x StartFraction 1
    13·2 answers
  • Solve using linear combination 5x+2y=10 3x+2y=6
    8·1 answer
  • There is two questions!
    5·1 answer
  • Jose D is looking for a skateboard. He sees one that costs $148. The owner is offering him a 20% discount.. What is the price of
    8·1 answer
  • Write the slope intercept equation of a line that has a 3 slope of 5 &amp; y-intercept of (0, –4). y =​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!