1. ## Math help?

Which expression, when evaluated, is less than zero?
7 + 4 • 12
7 4 12

(7 4) •12
(4 7) • (12)

Which property is demonstrated?
(25 • 84) •16 = 25 •(84 •16)

Commutative Property of Multiplication
Associative Property of Multiplication

Combine like terms to simplify the expression.
5 + 7 + 15xy2 + 8y3 + 10x – 13xy2 – 3x 9y3

y3 + 2xy2 + 7x + 12
y6 + 2x2y2 + 10x + 12
y3 – 2xy2 + 10x + 15
y3 + 2xy2 + 10x + 1

Use the distributive property and simplify the expression.
–9 – 4(2x + 1) + 8

8x + 3
–8x – 5
–8x – 2
–8x + 3

If a = 4.2, what is the value of a?

4.2

4

4

4.2

List the even integers between 1 and 20 in set notation.
{1, 3, 5, 7, 9, 11, 13, 15, 17, 19}
{3, 5, 7, 9, 11, 13, 15, 17, 19}
{2, 4, 6, 8, 10, 12, 14, 16, 18}
{1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20}

Which property is demonstrated?
a + 6 = 6 + a

Commutative Property of Multiplication
Associative Property of Multiplication

2. I'm concerned that you have posted a number of problems showing no work on your part. The first several are really just arithmetic problems. Please show what you have attempted.

3. Originally Posted by atthee
Which expression, when evaluated, is less than zero?
7 + 4 • 12
7 4 12 You would do the multiplication first, then subtract the product.
So, 7-48

(7 4) •12
(4 7) • (12)
For these two, because the subtraction is in parentheses, you would distribute the 12 and -12, both of which would result in positive numbers

Which property is demonstrated?
(25 • 84) •16 = 25 •(84 •16)

Commutative Property of Multiplication
Associative Property of Multiplication *The associative properties say that for three or more numbers, it does not matter when or in what order the computations are done. Whether you multiply the first and second and then the third, or the first and third and then the second, you will get the same answer

Combine like terms to simplify the expression.
5 + 7 + 15xy2 + 8y3 + 10x – 13xy2 – 3x 9y3

y3 + 2xy2 + 7x + 12
y6 + 2x2y2 + 10x + 12
y3 – 2xy2 + 10x + 15
y3 + 2xy2 + 10x + 1

Use the distributive property and simplify the expression.
–9 – 4(2x + 1) + 8

8x + 3
–8x – 5
–8x – 2
–8x + 3

If a = 4.2, what is the value of a?

4.2

4

4

4.2

List the even integers between 1 and 20 in set notation.
{1, 3, 5, 7, 9, 11, 13, 15, 17, 19}
{3, 5, 7, 9, 11, 13, 15, 17, 19}
{2, 4, 6, 8, 10, 12, 14, 16, 18}
{1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20}
See here Set Notation

Which property is demonstrated?
a + 6 = 6 + a

Commutative Property of Addition Same as associative but with less than 3 numbers
Commutative Property of Multiplication
Associative Property of Multiplication
This is very basic math. I helped on some of them above, but you should really take the time to learn these concepts.

4. To learn how to work with negative numbers, etc, try:

. . . . .Google results for "negative numbers"
. . . . .Google results for "order of operations"
. . . . .Google results for "simplifying with parentheses"

To learn about number properties and how to recognize them, try:

. . . . .Google results for "number properties"