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3 years ago

What is 2/7 divided by 1/5

2 answers:

6 0

To divide fractions just remember KFC
K: Keep (the first fraction)
F: Flip (the second fraction around)
C: Change (the divide symbol to multiplication)

2/7 ÷ 1/5

K

2/7 ÷ 1/5

F

2/7 ÷ 5/1

C

2/7 × 5/1

Multiply across

10/7

Eva8 [605]3 years ago

5 0

Remember this: dividing fractions is as easy as pie just flip the right and multiply.

So it’d be 2/7 * 5/1 which equals 1 3/7

2 * 5 = 10 over 7 * 1 = 7

10/7 simplified is 1 and 3/7

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Please help with this problem

Andre45 [30]

Answer:

The length of the short side is 14.5 units, the length of the other short side is 18.5 units, and the length of the longest side is 23.5 units.

Step-by-step explanation:

The Pythagorean Theorem

<em> If a and b are the lengths of the legs of a right triangle and c is the length of the hypotenuse, then the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse. </em>

This relationship is represented by the formula:

$a^2+b^2=c^2$

Applying the Pythagorean Theorem to find the lengths of the three sides we get:

$(x)^2+(x+4)^2=(x+9)^2\\\\2x^2+8x+16=x^2+18x+81\\\\2x^2+8x-65=x^2+18x\\\\2x^2-10x-65=x^2\\\\x^2-10x-65=0$

Solve with the quadratic formula

$\mathrm{For\:a\:quadratic\:equation\:of\:the\:form\:}ax^2+bx+c=0\mathrm{\:the\:solutions\:are\:}$

$x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$\mathrm{For\:}\quad a=1,\:b=-10,\:c=-65:\quad x_{1,\:2}=\frac{-\left(-10\right)\pm \sqrt{\left(-10\right)^2-4\cdot \:1\left(-65\right)}}{2\cdot \:1}\\\\x_{1}=\frac{-\left(-10\right)+ \sqrt{\left(-10\right)^2-4\cdot \:1\left(-65\right)}}{2\cdot \:1}=5+3\sqrt{10}\\\\x_{2}=\frac{-\left(-10\right)- \sqrt{\left(-10\right)^2-4\cdot \:1\left(-65\right)}}{2\cdot \:1}=5-3\sqrt{10}$

Because a length can only be positive, the only solution is

$x=5+3\sqrt{10}\approx 14.5$

The length of the short side is 14.5, the length of the other short side is $14.5+4=18.5$ , and the length of the longest side is $14.5+9=23.5$ .

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What is 3/5 ÷ 3/7 help please

Rus_ich [418]

3/5 / 3/7

= 3/5 * 7/3

= 7/5 or 1 2/7

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Step-by-step explanation:

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