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3 years ago

Josh will take 10 test in 5 weeks. How many tests will he have taken after 7 weeks?

2 answers:

6 0

I think you have to divide 10 by 5 which gives you 2 then multiply 2 by 7 which gives you 14. So I think he takes 14 tests in 7 weeks

Sedaia [141]3 years ago

3 0

Josh will take 25 test in 7 weeks.

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Need help with a system of equations

sweet [91]

Answer:

$\boxed{x - y = -2\sqrt{7}}$

Given:

$x + y = 4 \\ \\ {x}^{2} + {y}^{2} = 22 \\ \\ {x}^{4} = {y}^{4} - 176 \sqrt{7}$

Step-by-step explanation:

$= > {x}^{4} = {y}^{4} - 176 \sqrt{7} \\ \\ = > {x}^{4} - {y}^{4} = - 176 \sqrt{7} \\ \\ = > {( {x}^{2}) }^{2} - { ({y}^{2}) }^{2} = - 176 \sqrt{7} \\ \\ = > ( {x}^{2} + {y}^{2} )( {x}^{2} - {y}^{2} ) = - 176 \sqrt{7} \\ \\ = > ( {x}^{2} + {y}^{2}) (x + y)(x - y) = - 176 \sqrt{?} \\ \\ = > 22 \times 4(x - y) = - 176 \sqrt{7} \\ \\ = > 88(x - y) = - 176 \sqrt{7} \\ \\ = > x - y = - \frac{176 \sqrt{7} }{88} \\ \\ = > x - y = - 2 \sqrt{7}$

Identity used:

${x}^{2} - {y}^{2} = (x + y)(x - y)$

7 0

3 years ago

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Harrizon [31]

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snow_tiger [21]

Answer:

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Step-by-step explanation:

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What is the system of solution to y-x=-13 and -4x+3y=-51

poizon [28]

Equation 1 ==> y - x = -13
Equation 2 ==> -4x + 3y = -51
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Tcecarenko [31]

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