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3 years ago

Which of the following are identities?

Mathematics

2 answers:

USPshnik [31]3 years ago

4 0

Answer:

I believe that the answer is 1

Step-by-step explanation:

So an identity is an equation that both sides are equal. So in the first answer 3(5 +2x)=15+6x equals each other because after distributing the 3 into the (5+2X) it equals 15+6x

Bas_tet [7]3 years ago

3 0

Answer:

Step-by-step explanation:

3(5 + 2x) = 15 + 6x

15 + 6x = 15 + 6x

6x - 6x = 15 - 15

0 = 0

No solution, no identity.

y = x + 3

No identity.

Identity : a² - b² = (a + b) (a - b)

The only identity is option 3.

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3 years ago

There is 20% of a 50lb. Bag of dog food left. How much has been used?

Nitella [24]

Answer:

40 lbs was used

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If there is 20% left, that means 80% was used

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2 years ago

20+8(x-11)=-12 answer and how to solve it?

Eddi Din [679]

Answer: x=7

Step-by-step explanation:

To solve for x, you want to use algebraic properties.

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Now we know that x=7.

6 0

3 years ago

Find the width of the rectangular prism when the surface area is 208 centimeters

BlackZzzverrR [31]

Use the surface area formula of a rectangular prism to find the width. (I have changed it to use the same terms given in the problem).

(

)

Because of the given information, it is known that:

208

The width is not know, so let it keep it's variable

. But substitute the other values into the equation:

(

)

208

[

(

)

(

)

]

208

(

)

Use the distributive property to solve the right side of the equal sign:

208

(

)

208

112

The width is

5 0

3 years ago

There are 72 eight grade students and 84 sixth grade students participating in the Fun Run competition. The students will be put

tatiyna

Answer:

12 students

Step-by-step explanation:

Given that:

Eighth grade student = 72

Sixth grade student = 84

To group the students into the largest possible equal group with no student left, obtain the greatest common factor of the number of sixth grade and eighth grade student

Factors of 72:

72 : 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36

84 : 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 81

The greatest factor common in both numbers is 12.

3 0

3 years ago