List of Q&A

What does the ! mean in math formulas? 
Question I was taking an online test and the question was what does 4! mean. Do you know what this means?
Answer It's the factorial sign (!). 4!...

Problem Solving - Measure out 7 liters of water 
Question Candice has an 11-liter can and a 5-liter can. How can she measure out exactly 7 liters of water into a third unmarked container?
Answer...

Problem Solving: Find the time for the second bus to catch up  Not rated yet
Question A bus leaves a station at 8:00 a.m. and averages 30 mi/h. Another bus leaves the same station following the same route two hours after the ...

Evaluate 5*4+(5+2)+12-2^2  Not rated yet
Question 5*4+(5+2)+12-2^2

Answer Well to figure this out you have to know PEMDAS

PEMDAS (follow the order)
(P)arentheses
(E)ponents
(M/...

Problem Solving: Find the width of each column  Not rated yet
Question Ms. Williams wants to make a five-column grid on a page that is 22cm wide. Of these columns, the first three should be the same width, the ...

Simplifying an expression by removing the brackets  Not rated yet
Question I am trying to remember what the purpose is for the brackets in an equation. Example: 5{4(y – 4) + 15 – 2(5y – 3) +1} . Can someone ...

Word problem on Percentage  Not rated yet
Question In a room with 35 men, 80 percent of the occupants are women. How many women are in the room? Answer

STEP 1:   
The ...

Solve the equation: (x+2)(x+3)=1-x  Not rated yet
Question Solve the equation: (x+2)(x+3)=1–x.
Answer STEP 1:    To solve the given equation means to find the values of x that ...

Angle Measurements: Circle Graph  Not rated yet
Question A class budget consists of $900 for dances, $1200 for trips, and $600 for charity. If the data were presented in a circle graph, what will ...

Evaluate the expression: ab when a=-5 and b=10  Not rated yet
Question Evaluate ab when a=-5 and b=10.
Answer First, we must know that ab is the same as:
Now, since a is given as -5, we can substitute ...

Simplify the expression: –2(x–4)–(2x+1)  Not rated yet
Question Which expression is equivalent to –2(x–4)–(2x+1)?
a. –3x + 7
b. –3x – 7
c. –4x + 7
d. –4x – 7
Answer STEP 1:    You ...

Algebra Story Problem: Find the speed of the current   Not rated yet
Question Two miles upstream from his starting point, a canoeist passed a log floating in the river's current. After paddling upstream for one more ...

Simplify algebraic expression (involves algebraic fraction)  Not rated yet
Question Simplify the algebraic expression {3(a-b)/9} + {4b/9}
Answer STEP 1:    The numerator of the first fraction contains ...

Problem Solving: Find the age of the daughter  Not rated yet
Question If the age of a father is 2 times greater than his son and 3 times than his daughter, and their total age is 88. What is the age of daughter?...

Problem Solving - Find the total time to paint a house  Not rated yet
Question If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for both of them to paint the ...

Evaluate n+6 when n=1  Not rated yet
Question Evaluate the expression, n+6 when n=1.
Answer It quite simple to evaluate n +6 . Given that n=1 , we can just replace (i.e. substitute)...

Adding or Subtracting expressions  Not rated yet
Question When adding or subtracting expressions, how do you identify the like terms?
Answer You can watch the math videos in the following links:...

Writing an Algebraic Expression  Not rated yet
Question If n is equal to the number of rides and 1 ride is 2.00 and 2 rides is 2.50, write an expression using n to show the cost.
Answer Base ...

Solving a cubic equation by factorization  Not rated yet
Question Solve this equation: 3x^3 -8x^2 +4x=0
Answer Solving 3x 3 -8x 2 +4x = 0 means that we need to find the values of x that satisfy the ...

Solve the Equation: -5x + 9 = 3  Not rated yet
Question Solve the equation: -5x+9=3
Answer Solving this equation means that we need to find the value of x. Below are the steps to do so:

To ...

Solve the Equation: (x-2)/3 = (28-2x)/6  Not rated yet
Question Solve the following equation: (x-2)/3 = (28-2x)/6
Answer Solving this equation means that we need to find the value of x. Below are the ...

Expanding Brackets - Quadratic Factors  Not rated yet
Question Expand (y+1)(y-3).
Answer Before we expand (y+1)(y-3), let's take a look at the basic ideas behind removing brackets for p (y-...

Evaluate the expression 3z + 3  Not rated yet
Question Evaluate the expression 3z+3 when z = 5.
I say the answer is 15, my son says the answer is 18. We have been arguing over this for 20 minutes....

Word Problem - Dimes and Nickels  Not rated yet
Question Dave has a total of $4.50. He has twice as many dimes as nickels. How many of each coin does he have?
Answer Before we can solve this ...

Difference between an equation and an expression  Not rated yet
Question Solve the equation 2(3x-1)-x+7
Answer First, I need to clarify a common misunderstanding between 'solving equation' and 'simplifying ...