Evaluate
91.5
Factor
\frac{3 \cdot 61}{2} = 91\frac{1}{2} = 91.5
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18.5+10+8+8+6+6+15+20
Add 6 and 12.5 to get 18.5.
28.5+8+8+6+6+15+20
Add 18.5 and 10 to get 28.5.
36.5+8+6+6+15+20
Add 28.5 and 8 to get 36.5.
44.5+6+6+15+20
Add 36.5 and 8 to get 44.5.
50.5+6+15+20
Add 44.5 and 6 to get 50.5.
56.5+15+20
Add 50.5 and 6 to get 56.5.
71.5+20
Add 56.5 and 15 to get 71.5.
91.5
Add 71.5 and 20 to get 91.5.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}