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Help!! Im stuck on this question!

For some reason 1+i = root 2 * e ^ pi / 4 which i dont understand how so I would like an explanation for this...

I just need help with my homework

idk it pls help

im stuck on this question

because e.g.:3n+9

Dividing fractions

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1/a2sin2x-cos2x

please help i'm stuck on this formula questions

simplify the perimeter of a triangle( 8x-8w)+(3x+8y)+(4y+4w)

calculate the formula using bidmas without a calculator

Find the volume of the pile of soil excavated from a trench 650mm wide, 95cm deep and 6.51m long. Assume the loose; excavated soil volume increases by 12% (the bulking factor). Give your answer in...

How do I do this?

I do not know the answer to this question

How is x + 2 - x ^ 2 + 4x + 3/x^ 2 - 9 equivalent to x ^ 2 - 2x - 7/ x - 3. x not equal - 3 and x not equal 3

solve for x

Y=x2-2x-3

Farmer Tom has a Bull pen that is 3500m wide by 1500m tall. He wants to cut diagonally across the pen to save time. If he walks at 5km/h how much time will he save by crossing diagonally across the...