What is mental mathematics

Write a linear equation in slope-intercept form with the given information. passes through (-4,11) and (2,8)

A developer has 7 1/2 acres of land to build houses on. If each house is to be built on 1/4 acre plot, how many houses can he build?

93 divided 3.1 trillen

Between 2005 and 2009 the average rate of inflation was about 2.2% per year. if a cart of groceries cost $120 in 2005, what did it cost in 2009?

What r the greatest common factor of 42 and 32

Every day, Bert spends an hour commuting to and from his office, driving at an average speed of 50 mph and taking the same route each way. How far does Bert live from his office?

Write this number in standard form. 7 millions, 14 hundred thousands, 8hundred, 2 ones

One morning in Helena, Montana the temperature was 12 degrees Fahrenheit ( f. below zero. By noon the temperature had risen 25° f. Which expression can be used to find the temperature, in degrees F, at noon that day in Helena, Montana?

How many fluid ounces are in 3620.8 cm squared?

If the angles of a triangle are represented by x, 3x+20, and 6x. then what type of triangle is it?