  • Matrices
• Algebra
• Geometry
• Graphs and functions
• Trigonometry
• Coordinate geometry
• Combinatorics
 Suma y resta Producto por escalar Producto Inversa
 Monomials Polynomials Special products Equations Quadratic equations Radical expressions Systems of equations Sequences and series Inner product Exponential equations Matrices Determinants Inverse of a matrix Logarithmic equations Systems of 3 variables equations
 2-D Shapes Areas Pythagorean Theorem Distances
 Graphs Definition of slope Positive or negative slope Determine slope of a line Equation of a line Equation of a line (from graph) Quadratic function Parallel, coincident and intersecting lines Asymptotes Limits Distances Continuity and discontinuities
 Sine Cosine Tangent Cosecant Secant Cotangent Trigonometric identities Law of cosines Law of sines
 Equations of a straight line Parallel, coincident and intersecting lines Distances Angles in space Inner product

# Histograms

A histogram is a type of bar graph that represents the frequency of data that has been grouped in several intervals.

Read the histogram and answer the following questions: 1. How many workers are in the maximum salary group? 5 workers.
2. In which salary group are the maximum workers? 930-940.
3. What is the size of each class? 10.
4. How many workers get less than $930? 55 workers. 5. How many get$930 or more? 70 workers.
6. What is the total number of workers? 125 workers.

The histogram below shows retirement ages of people in Williams School District. How many people were at least 65 years old when they retire?

50
60
70
80