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Mazyrski [523]
3 years ago
6

This is similar to another problem but read carefully... This is a little more challenging: 2 diamond rings and 4 silver rings c

ost $1880. A diamond ring and silver ring cost $880. How much does a silver ring cost? How much does a diamond ring cost?
Mathematics
1 answer:
ValentinkaMS [17]3 years ago
3 0

Answer:

$820

Step-by-step explanation:

D= Diamond Ring

S= Silver Ring

2D + 4S = 1880

D + S = 880

D = 880 - S

4S + 2(880 - S) = 1880

4S + 1760 - 2S = 1880

2S + 1760 = 1880

2S =  120

S = 60

880 - 60 = 820.

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1 chip is $10
So, for 79 chips,
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5 0
3 years ago
What is the value of a1 for a geometric sequence with a4=40 and a6=160?
Elenna [48]

Answer:

5

Step-by-step explanation:

The nth term of a geometric series is:

a_n = a₁ (r)^(n-1)

where a₁ is the first term and r is the common ratio.

Here, we have:

40 = a₁ (r)^(4-1)

160 = a₁ (r)^(6-1)

40 = a₁ (r)^3

160 = a₁ (r)^5

If we divide the two equations:

4 = r^2

r = 2

Now substitute into either equation to find a₁:

40 = a₁ (2)^3

40 = 8 a₁

a₁ = 5

6 0
3 years ago
Given: a-b= c-d, b=d-1, c=6; prove: a=5
Brut [27]

Given :

a-b = c-d    ...1)

b = d-1       ...2)

c = 6

To Prove :

a = 5

Solution :

Adding equation 1 and 2, we get :

(a-b) + (b) = (c-d) + (d-1)

a = c -1   ...3)

Putting given value of c = 6 in above equation, we get :

a = 6 - 1

a = 5

Hence, proved.

6 0
3 years ago
7x + 10 = 2x what is the answer to this
yan [13]

Answer:

X = -2

7x + 10 = 2x

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x = -2

Hope this helped!! Have a blessed day!!!

3 0
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Step-by-step explanation:

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