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suter [353]
3 years ago
5

Mark invested $500 in an account that pays 9% annual simple intrest.Make will not make any additional deposits or withdrawls.How

much will mark earn on his investment at the end of 7 years
Mathematics
1 answer:
Semenov [28]3 years ago
4 0

Answer:

$815

Step-by-step explanation:

Given data

Principal= $500

Rate= 9%

TIme= 7 years

The simple interest formula is

A=P(1+rt)

substitute

A= 500(1+0.09*7)

A=500(1+0.63)

A= 500*1.63

A=$815

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A jeweler had a fixed amount of gold to make bracelets and necklaces. The amount of gold in each bracelet is 5 grams and the amo
krok68 [10]

Answer:

The jeweler made 9 necklaces.

The jeweler made 8 bracelets.

Step-by-step explanation:

x = number of bracelets

y = number of necklaces

17 = x + y

238 = 5x + 22y

Make one of the coefficients, x, the same.

17 = x + y

Multiply this equation by 5.

85 = 5x + 5y

Subtract the equations to get rid of x.

(238 = 5x + 22y) - (85 = 5x + 5y)

(5x - 5x) + (22y - 5y) = 238 - 85

22y - 5y = 238 - 85

17y = 153

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The jeweler made 9 necklaces. Substitute this back into one of the equations to find x.

17 = x + y

17 = x + 9

17 - 9 = x

x = 8

238 = 5x + 22y

238 = 5x + 22(9)

238 = 5x + 198

238 - 198 = 5x

40 = 5x

x = 40/5

x = 8

The jeweler made 8 bracelets.

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3 years ago
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