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3 years ago

Is 7x - 5 =2x + 8 true when x =2

Mathematics

2 answers:

mylen [45]3 years ago

8 0

Answer:

Step-by-step explanation:

Plug in 2 for x

7(2) - 5 = 2(2) +8

14 -5 = 4 + 8

9 = 12

9 does not equal to 12, which means it's not true.

svetlana [45]3 years ago

4 0

Answer:

No its not true

Step-by-step explanation:

(7x2)-5= 14-5= 9

(2x2)+8= 4+8= 12

9=12

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The area of a parallelogram is 3.36 square feet. the base is 2.8 feet. if the measures of the base and height are each doubled,

kolbaska11 [484]

A =bh

Plug in values and solve for height (h).
A=3.36
b=2.8

3.36 = 2.8h
/2.8 /2.8
1.2 = h

Base and Height doubled:
b = 2.8
h = 1.2

2(2.8)=5.6
2(1.2)=2.4

Plug in new b and h to area equation given to find area:
5.6(2.4) = 13.44

Resulting parallelogram area = 13.44 ft^2

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2 years ago

Distribute and combine like terms.<br> 3(2x - 7) +5

NeTakaya

When you distribute, it would be 6x - 21 + 5

-21 + 5 = -16

this means the answer would be left as 6x - 16

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2 years ago

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nasty-shy [4]

Answer:

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3 years ago

An expression that uses variables to state a rule is a ______

nikdorinn [45]

<u>Formula</u>

<em>An expression that uses variables to state a rule is a </em><u><em>formula</em></u>

<h2>Explanation:</h2>

An expression that uses variables to state a rule is a formula. It's important to know that formulas uses the equals sign (=) and includes two or more variables. Formulas gives us information that we express symbolically. For example, the well known formula for the volume of a sphere is defined as:

$V=\frac{4}{3} \pi r^3 \\ \\ \\ Where: \\ \\ V:Volume \ of \ the \ sphere \\ \\ r:Radius \ of \ the \ sphere$

So in this formula we have a relationship between the volume of a sphere and its radius, so if we have information about the radius of it we can easily calculate the volume of it.

<h2>Learn more:</h2>

Volume of prism: brainly.com/question/12501166

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3 years ago

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At which root does the graph of f(x) = (x + 4)(x + 7,5) cross the x-axis?<br> -7<br> -4<br> 4<br> 7

Alona [7]

Answer:

Answer: -7

Step-by-step explanation:

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2 years ago