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jenyasd209 [6]
2 years ago
9

The original price of a pair of shoes is $42 the sale price is 20% off their original price what is the amount of original price

Mathematics
2 answers:
SVETLANKA909090 [29]2 years ago
4 0

Answer:

33.60 I dont expect you to mark me brainliest. i even spelled that wrong. Im too lazy to write down the step by step.

Brrunno [24]2 years ago
3 0
First you convert 20% into a decimal which is 0.2 and multiply that by 42 and you get 8.4, that's the discount. Then you subtract 8.4 from 42 and get $33.60 which is your answer. Hope this helps!!
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saveliy_v [14]

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Use Cramer's rule to find the solution to the following system of linear equations.
slavikrds [6]

Answer:

x = 53

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Step-by-step explanation:

Step(I):-

Given equations are

x -2y =-7 ...(I)

5x-9y =-5 ..(ii)

The matrix form  AX = B

                    \left[\begin{array}{ccc}1&-2\\ 5  & -9\\\end{array}\right] \left[\begin{array}{ccc}x\\y\\\end{array}\right] = \left[\begin{array}{ccc}-7\\-5\\\end{array}\right]

The determinant

= \left|\begin{array}{ccc}1&-2\\5&-9\\\end{array}\right| = -9+10 =1

By using Cramer's Rule

Δ₁ =      \left[\begin{array}{ccc}-7&-2\\\\-5&-9\end{array}\right]



The determinant is     Δ₁ = -9 X -7 - (10 ) = 53

x = Δ₁ / Δ

x = 53

The determinant

Δ₂ =



Δ₂ = -5 +35

     

 

y = Δ₂/Δ =  30

     

5 0
2 years ago
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Which expression is equivalent to (+12)×5+7 ?
riadik2000 [5.3K]
B

(12)x5 + 7
\ /
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