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Elza [17]
3 years ago
9

Find the sum of the first 50 terms of the sequence -6, -2, 2, 6

Mathematics
1 answer:
monitta3 years ago
4 0

Answer:

4600

Step-by-step explanation:

STEP 1: Determine type of progression

d1 =  - 2 - ( - 6) \\ d1 = 4 \\  \\ d2 = 2 - ( - 2) \\ d2 = 4

Since d1 = d2, it is Arithmetic progression, with a common difference of 4

STEP 2: Evaluate the sum

s =  \frac{n}{2} (2a + (n - 1)d) \\ s =  \frac{50}{2} (2( - 6) + (50 - 1)4) \\ s = 4600

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A loss of 30 yards is less than a loss if 50 yards. Write an equality statement
Dafna1 [17]
100-30=70-50=20
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8 0
3 years ago
For the class of 2013's prom Norman's dress shop sold cheaper dresses for $90 each and more expensive dresses for $140 each. The
Tema [17]

Answer:

Number of cheaper dresses sold  is 35

Number of expensive  dresses sold  is 15

Step-by-step explanation:

Given:

Cost of cheaper dresses = $90

Cost of  expensive dresses = $140

Total cost of  the dresses = $5250

To Find:

Number of cheaper dress = ?

Number of expensive  dress = ?

Solution:

Let

The number of  cheaper dresses be x

The number of  expensive dresses be y

(Number of cheaper dresses X cost of cheap dress) +  (Number of Expensive dresses X cost of  expensive dress)  =  $5250

x \times90 +y \times 140 = 5250=  $5250

It is given that the 20 more of the cheaper dresses than the expensive dresses is sold

So,

number of cheaper dress  =  20  +  number of expensive dress

x = 20 + y---------------------------------------(1)

(20+y) \times90 +y \times 140 = 5250 = 5250

(20 \times 90 +y\times 90) +y \times 140= 5250

1800 + 90y+ 140y = 5250

1800 + 230y = 5250

230y =5250 -1800

230y = 3450

y = \frac{3450}{230}

y = 15

Substituting y in (1)

x = 20 +15

x= 35

5 0
3 years ago
What is the median of 0.8, 1.0, 2.7, 2.8, 3.1, 13.3
tresset_1 [31]

Answer:

2.75

Step-by-step explanation:

<u>Step 1:  Determine the median</u>

0.8, 1.0, 2.7, 2.8, 3.1, 13.3

The median of a set is the middle of the set.  In this instance, we have 6 numbers so we don't have a number directly in the set representing the median.  Instead, we need to find the average or middle between the 3rd and 4th number.  So we take 2.7 and 2.8, add them together to get 5.5 and then we divide by 2 to get 2.75 which is our median.

Answer:  2.75

5 0
2 years ago
Read 2 more answers
Can someone please help me with this question?<br><br> Find the value of c-5 when c=14
vlada-n [284]
1) C-5
2)14-5
3)9=The value!
I hope this helps!
3 0
3 years ago
0. 00147 in standard form
fenix001 [56]

Answer:

Answer: It can be written as 1.47x10-³

Step-by-step explanation:

0.00147 = 1.47

1.47 = 1.47 x 10 -^3

4 0
3 years ago
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