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3 years ago

Assume you have a balance of $1,900 on a credit card.

Mathematics

1 answer:

dimaraw [331]3 years ago

8 0

principal=$1900

rate =13.6 %

simple interest= $35

Time=?

SIMPLE INTEREST ={PRINCIPAL×RATE×TIME}/{100}

$35= ${$1900 ×13.6× TIME}{100} /$

$35×100=25840× TIME

TIME= $\bold\frac{ 3500}{25840}$

TIME= $700/5168$

TIME= ${\tt{\green{\underline{\underline{\huge{0.1354489164}}}}}}$ years

sorry I can't solve wrong answer

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A tv costs £800 plus VAT at 20% what is the total cost of the tv?

slamgirl [31]

hello friend ☺

Given :

TV cost = 800 £

VAT = 20 %

Amount of VAT

= 20% of 800

= 800 × 20 /100

= 160 £

So Total cost of TV

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= 800 + 160

= 960 £

Thanks ❤

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3 years ago

Can somebody solve this system equation using addition please?

givi [52]

-4x - 5y = 7

3x + 5y = -14

You can add these two equations together straightaway since the y-terms have opposite coefficients.

-4x - 5y = 7

3x + 5y = -14

+___________

-x - 0 = -7

-x = -7

x = 7

Substitute 7 for x into either of the original equations and solve algebraically to find y.

3x + 5y = -14

3(7) + 5y = -14

21 + 5y = -14

21 = -14 - 5y

35 = -5y

-7 = y

Finally, check work by substituting both x- and y-values into both original equations.

-4x - 5y = 7

-4(7) - 5(-7) = 7

-28 + 35 = 7

7 = 7

3x + 5y = -14

3(7) + 5(-7) = -14

21 - 35 = -14

-14 = -14

Answer:

x = 7 and y = -7; (7, -7).

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