Pre-algebra Assignment: Using Variables?

Question

Six + x is an example of _____.

a variable
an expression
a constant
a formula

[] Question #2
[] MultipleChoice




I = prt is an example of _____.

a variable
an expression
a constant
a formula

[] Question #3 Reassigned
[] MultipleChoice



If m = 8 and n = 4, all of the following represent the same value except _____.

m − n

m
mn

[] Question #4
[] MultipleChoice



Seven is not an example of _____.

a variable
an expression
a constant
a term

[] Question #5 Reassigned
[] Matching


Evaluate each expression if a = 6, b = 3, and c = 2.

1. ab 2
2. c + 4 4
3. 1
4. a − b 3
5. 2c 8
6. b ÷ 3 6
7. a − 1 18
8. 6 + c 5

[] Question #6
[] MultipleChoice



The formula commonly used to find simple interest is i = prt.

What is the simple interest if p = 1000, r = 0.05, and t = 1?

1001.05
1050
500
50

[] Question #7
[] MultipleChoice
:


All of the following are equivalent except _____.

4 · y
4 + y
4y
(4)(y)

[] Question #8
[] MultipleChoice



Using the formula d = r t, which of the following statements is not true?

If r = 3 and t = 4, then d = 12.
If r = 3 and t = 5, then d = 8.
If r = 4 and t = 2, then d = 8.
If r = 5 and t = 3, then d = 15.

[] Question #9
[] MultipleChoice



K is an example of _____.

a variable
an equation
a constant
a formula

[] Question #10
[] MultipleChoice


The area of a triangle is found using the following formula:


If b = 3 in. and h = 8 in., what is the area of the triangle?

5.5 in.2
12 in.2
24 in.2
48 in.2

Answer 1

1. expression



2. formula



3. mn



4. a variable



5. You can solve these.



6. 50



7. 4 + y



8. If r = 3 and t = 5, then d = 8.



9. a variable



10. 12 in.2

Answer 2

I will give you the answers, but you really should try to do these yourself. After all, that's how you learn and that's how you practice for other tests/quizzes, so yeah. :) I'm in a different math that's WAY ahead of you, and I hope these are correct.



1. an expression

2. a formula

3. mn

4. an expression

5.....ab = 6x3 = 18

....c+4 = 2+4 = 6

....[what?]

....a-b = 6-3 = 3

....2c = 2x2 = 4

....b-3 = 3-3 = 0

....a-1 = 6-1 = 5

....6+c = 6+2 = 8

6. 50 -> multiply them together and the product is the answer

7. 4 + y -> everything else is multiplication.

8. If r = 3 and t = 5, then d = 8 -> multiplication, not addition... 3x5 definitely doesn't equal 8.

9. a variable -> most letters [a, b, x, etc.] are used as variables

10. 12 in.2 -> area of triangle = 1/2bh

Answer 3

For substitution, isolate a variable of one equation, then plug it into the different. for example. y = 4x + 5 and 5x + 2y = 7 Plug interior the definition of y from the equation on the left to get: 5x + 2(4x + 5) = 7 you may Then resolve for x, and finally plug the x fee into the 1st equation to get extensive variety values for the two variables. To do removal, this is relatively merely addition/subtraction. Say you have 4x + 2y = a million and 5x - y = -3. in case you multiply the 2nd equation via 2 (to get y words of opposite coefficients), you get: 10x - 2y = -6. Now merely upload: 4x + 2y = a million 10x - 2y = -6 -------------------- 14x = -5 x = -5/14 then you definately could plug x into the two equation to get y. wish that helps =D