Subtract-3 2/7- (-5/7) PLEASE HELP

Mathematics

1 answer:

ELEN [110]3 years ago

4 0

Answer:

Step-by-step explanation:

$3\frac{2}{7}-(-\frac{5}{7} )\\\\=3\frac{2}{7}+\frac{5}{7}\\\\=3+\frac{2}{7}+\frac{5}{7}\\\\=3+\frac{2+5}{7}\\\\=3+\frac{7}{7}\\\\=3+1\\\\=4$

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Solve for j: j + j / 2 + J + 5 = 45

Georgia [21]

Answer:

j:5j/2+5=45 Or j=16 how you put it was a little confusing

5 0

2 years ago

Plz help me!!!!!!!!!

Over [174]

Answer: $\bold{\dfrac{4\pm \sqrt{6}}{2}}$

<u>Step-by-step explanation:</u>

$\dfrac{3}{y-2}-2=\dfrac{1}{y-1}\\\\\\\text{Multiply by the LCD (y-2)(y-1) to clear the denominator:}\\\\\dfrac{3}{y-2}(y-2)(y-1)-2(y-2)(y-1)=\dfrac{1}{y-1}(y-2)(y-1)\\\\\\3(y-1)-2(y-2)(y-1)=1(y-2)\\\\3y-3-2(y^2-3y+2)=y-2\\\\3y-3-2y^2+6y-4=y-2\\\\-2y^2+9y-7=y-2\\\\0=2y^2-8y+5\quad \rightarrow \quad a=2,\ b=-8,\ c=5\\\\\\\text{Quadratic formula is: }x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\\\x=\dfrac{-(-8)\pm \sqrt{(-8)^2-4(2)(5)}}{2(2)}\\\\\\.\ =\dfrac{8\pm \sqrt{64-40}}{2(2)}$

$.\ =\dfrac{8\pm \sqrt{24}}{2(2)}\\\\\\.\ =\dfrac{8\pm 2\sqrt{6}}{2(2)}\\\\\\.\ =\dfrac{4\pm \sqrt{6}}{2}$