x-15% = 100
x = 100+15%
= 100 + 3/20
= 2003/20
= 100.15
Sine is \(\frac{opposite}{hypotenuse}\)
Cosine is \(\frac{adjacent}{hypotenuse}\)
Tangent is \(\frac{opposite}{hypotenuse}\)
Take logarithms on both sides
log 0.254 = X log 0.5
Therefore X = log 0.254 / log 0.5 ≈ 1.977099598.........
600 + 14.36%
= 600 + 0.1436
= 600.1436
3^4=81
x/(x-7) = y
x = y(x-7)
x = xy-7y
x-xy = -7y
xy-x = 7y
x(y-1) = 7y
x = 7y/(y-1)
72 * 3 = 216
Calculators are always your best friend
any number except 0 to the power of 0 is 1
because \(0^0 = 0{}^{-0}=1/0^0 = infinity\)
2^0 = 1
\((a+1)(a+2)=(a)(a+2)+1(a+2)=(a)(a)+2a+a+2=a^2+3a+2\)
