All categories

3 years ago

Which property applies only to addition and multiplication?

2 answers:

6 0

C. Because if you have 2+6 and 3×4. Inverse property can inverse 2+6 into 6+2. With 3×4, you can change it into 4×3 and the solution/answer won't change. But if you have division or subtraction, then it won't work. Example:
5-4=1 but 4-5 doesn't equal 1. 14÷7=2, but 7÷14 doesn't equal 2. So that is why C. Inverse Property is the answer

Anna [14]3 years ago

4 0

The answer is D
Hope this helps

You might be interested in

The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard dev

Blababa [14]

Answer:

0.3707

Step-by-step explanation:

Mean length = 30.05 inches

Standard deviation = 0.3 inches

We are supposed to find the probability that the average length of a steel sheet from a sample of 9 units is more than 29.95 inches long

Formula : $Z=\frac{x-\mu}{\sigma}$

$\mu = 30.05\\\sigma = 0.3$

x= 29.95

Substitute the values :

$Z=\frac{29.95-30.05}{0.3}$

$Z=-0.33$

Refer the z table for p value

p value = 0.3707

So, the probability that the average length of a steel sheet from a sample of 9 units is more than 29.95 inches long is 0.3707

3 0

3 years ago

Cynthia besch wants to buy a rug for a room that is 23ft wide and 26ft long. She wants t ok leave a uniform strip of floor aroun

Lostsunrise [7]

Answer:

Dimension of rug is $(15\times 18)\ ft$

Step-by-step explanation:

Given: Area of rug= 270 ft²

Cynthia besch wants to buy a rug for a room that is 23ft wide and 26ft long.

Let´s assume the uniform strip size of floor around rug be "x".

As given, Cynthia wants to leave a uniform strip of floor around the rug.

∴ Rug dimension will be $(23-2x)\times (26-2x)$

We know, area of rectangle= $width\times length$

Forming an equation for area of rug.

⇒ $270= (23-2x)\times (26-2x)$

Now solving the equation to find the dimension of rug.

$270= (23-2x)\times (26-2x)$

Using distributive property of multiplication.

⇒ $270= 598-46x-52x+4x^{2}$

⇒ $598-98x+4x^{2}= 270$

Subtracting both side by 270

⇒ $4x^{2}-98x+328= 0$

using quadratic formula to solve the equation.

⇒ Formula: $\frac{-b\pm \sqrt{b^{2}-4(ac) } }{2a}$

∴ In the expression , we have a= 4, b= -98 and c= 328.

Now, subtituting the value in the formula.

= $\frac{-(-98)\pm \sqrt{-98^{2}-4(4\times 328) } }{2\times 4}$

= $\frac{98\pm \sqrt{9604-4(1312) } }{8}$

Opening parenthesis.

= $\frac{98\pm \sqrt{9604-5248 } }{8}$

= \frac{98\pm \sqrt{4356}}{8}

We know 66²=4356 and √a²=a or -a

= $\frac{98\pm 66}{8}$

= $\frac{98+66}{8}\ or \ \frac{98-66}{8}$

= $20.5 \ or\ 4$

∴ Value of x will be either 20.5 ft or 4 ft

Ignoring decimal value, therefore taking value of x is 4 ft

Subtituting the value of x to find the dimension of rug.

Width of rug= $(23-2x)$

⇒ Width of rug= $23- 2\times 4$

⇒ Width of rug= $23-8= 15\ ft$

Next, Length of rug= $(26-2x)$

⇒ Length of rug= $(26-2\times 4)$

⇒ Length of rug= $26-8= 18\ ft$

Hence, dimension of rug is $(15\times 18)\ ft$

6 0

3 years ago

Find the slope of the line that passes through the points (-12,-5)(0,-8) enter your answer as a fraction with no spaces

Svetach [21]

Answer:

Slope = -1/4

Step-by-step explanation:

Slope = (-8 + 5)/(0 + 12) = -3/12 = -1/4

3 0

3 years ago

Read 2 more answers

Somebody come help me I'm stuck in this problem how do I simplify it using exponent rule

Darina [25.2K]

Answer:

-5x^4y^3

Step-by-step explanation:

so you divide -25 by 5 and the rule is if it is division for exponents then you subtract the exponent so 6-2=4, 7-4=3, 3-3=0. z^0 is 1 so we don't have to write it out.

6 0

3 years ago

960 square feet of carpet in 2hours is it equivalent or not?

zimovet [89]

Answer:

City Carpet and Flooring advertises that they can install 1,200 square feet

of carpet in 2 hours. Select whether each installation rate has the same

unit rate, in square feet per hour, as City Carpet and Flooring. 7.RP.1,7.NS.3

Yes No

960 square feet of carpet in 2 hours

1,000 square feet of carpet in 12 hours

320 square feet of carpet in hour

Step-by-step explanation:

4 0

3 years ago