# Free iOS App Today: Solve – A colorful graphing calculator

http://mathstud.io

Solve is a calculator like no other! Solve solves expressions as you type and features an innovative memory system to store and recall answers. Simply touch the answer to store it and touch the stored answer to use it in an expression.

Solve has four tabs that select four different calculators each with its own color. Multiply numbers, calculate a tip and find a square root all without clearing your results!

Plot graphs with a single touch! Solve plots 2D and 3D functions using the x, y and θ variables. When you use the x, y and θ variables in an equation the answer will say Touch to Plot. Touch this label to graph the equation.

GRAPHING
Plot functions using the x variable. For example, "y=sin(x)" is just entered as "sin(x)".
• cos(x)
• abs(x)
• x^2+2x+6

POLAR GRAPHING
Plot polar equations using the θ variable. For example, "r=2θ" is just entered as "2θ".
• 2θ
• sin(2θ)

3D GRAPHING
Plot 3D functions by using the x and y variables. For example, "z=x+y" is just entered as "x+y".
• cos(x)+sin(y)
• x^2+y^2

PLOT MULTIPLE GRAPHS
Graph multiple functions by separating each equation with a comma.
• sin(x),cos(x)
• x,x^2,x^3

TIME GRAPHING
The T variable is used to create animated or time plots.
• cos(x+T)
• sin(x+T)*x
• cos(x+T)+sin(y+T) #### Nathan Smith

Nathan Smith is Director of Technology for the College of Education and Human Services at Utah State University. In that role, he also directs The Adele & Dale Young Education Technology Center (The YETC) located in room 170 of the Education Building on Utah State University's Logan campus. The YETC is a combination student open­access computer facility, a K­12 curriculum materials library, a NASA Educator Resource Center for Utah, and a technology training center. Nathan served eight years (2004­2012) on the Board of Directors for the Utah Coalition for Education Technology (UCET) He was re­elected in 2014 to serve another two year term on the board. A former elementary school teacher, Nathan has taught students every age from young children to senior citizens. He has had the opportunity beginning in 2011 to train international high school teachers from all over the world about technology in education, through the U.S. State

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