A chemical compound has a mass of 15/16 grams. If 2/3 of the mass of this compound is hydrogen, what is the actual mass of hydrogen in this compound.
15/16 x 2/3 = 30/48 = 10/16 = 5/8
100
What is a stratified sample?
Population is broken into specific groups, the same fraction of people are.
100
What do you do when your multiplying or dividing inequalities?
Reverse the inequality sign when dividing or multiplying both sides of the inequality by the same negative number.
100
2x + 1/10 = 3/5
x = 1/4
100
A car leaves Ottawa traveling at 40km/h. A second car leaves Ottawa one hour latter and travels at 60km/h. How far from Ottawa does the second car overtake the first?
120 km away from Ottawa.
200
What do you do to divide fractions?
Multiply by the recipical
200
What does generalize mean?
Making a broad statement from known facts.
200
What is a scale factor?
The constant amount that all dimensions of an object and multiplied by to either enlarge or reduce an object.
200
1/2n = 2/5 + 1/5n
n = 1 1/3
200
John is twice as old as Bill. In five years, the sum of their ages will be 34. Find their present ages.
John is 16
Bill is 8
300
What does ≥ mean?
Greater than or equal to.
300
What are the 3 key ways for looking into a pattern?
- Describe the pattern
- Create a table of values
- Write the linear equation to represent the pattern
300
If one room has the length of 5y and width of 2y and another room combined with the length of 2, what is the combined area of the room?
(2y)(5y+2)
300
A rectangular field is (4x+2)m long. The width of the field is 2m shorter than the length. What is the expression for area of the field?
(4x + 2)(4x)
300
Jet Jones left Montreal at 4pm traveling west 116/h. One hour later (5pm), Barry brown left Montreal traveling east at 84km/h. At what time will they be 316 km apart?
2 hours
400
What is a variable?
The unknown number in an expression.
400
What's a degree of a term?
Sum of the exponents in a single term.
400
How many line symmetry is on a square?
4
400
A rectangular skateboard is (3x)m long. It's width is 4m less than the length. If x is 15, what is the area of the park?
(3 x 15) x (3 x 15 - 4) = 1845m^2
400
A mother is 3 years less than five times as old as her daughter. If the sum of their ages is thirty - nine, find the age of each.
Mother - 32 years old
Daughter - 7
500
What's a rational number?
Number's that can be expressed in fraction form. a/b
500
What's the degree of 4a^7 + 6a^2 + 3?
7
500
What's an inscribed angle?
An angle that is half the size of the central angle.
500
A rectangular packing crate has the dimensions shown in meters.
Length - 2x
Width - x
Height - 2x + 2
What is an expression for the total surface area of the crate?
2(2x + 2)(x) + 2(2x)(x) + 2(2x+2)(2x)
500
I have seven more nickels than dimes. If the total value of the coins is $2.30, how many of each type do I have?