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Nataly [62]
2 years ago
7

What is the value of the expression 3.2(2.3)−4.8

Mathematics
2 answers:
Anna71 [15]2 years ago
8 0
It is 2,56 i think but i dont completely know thoe


weqwewe [10]2 years ago
7 0
First Multiply 3.2 times 2.3 which would equal 7.36. After that subtract 4.8 from 7.36 which would equal 2.56. Final Answer:  2.56
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Answer:

Answer is A

Step-by-step explanation:

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The volume of a drop of a certain liquid is 0.000047 liter. Write the volume of the drop of a liquid in a scientific notation. 
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2 years ago
In a triangle ABC, measure of angle B is 90 degrees. AB is 3x-2 units and BC is x+3. If the area of the triangle is 17 sq cm, fo
Scorpion4ik [409]

Answer:

x=\frac{8}{3}\ cm

Step-by-step explanation:

we know that

The area of the right triangle ABC is equal to

A=\frac{1}{2}(AB)(BC)

we have

A=17\ cm^2

AB=(3x-2)\ cm

BC=(x+3)\ cm

substitute the values

17=\frac{1}{2}(3x-2)(x+3)

34=(3x-2)(x+3)

34=3x^2+9x-2x-6

3x^2+7x-6-34=0

3x^2+7x-40=0

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

is equal to

x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}

in this problem we have

3x^2+7x-40=0

so

a=3\\b=7\\c=-40

substitute in the formula

x=\frac{-7(+/-)\sqrt{7^{2}-4(3)(-40)}} {2(3)}

x=\frac{-7(+/-)\sqrt{529}} {6}

x=\frac{-7(+/-)23} {6}

x=\frac{-7(+)23} {6}=\frac{16}{6}=\frac{8}{3}

x=\frac{-7(-)23} {6}=-5

therefore

The solution is

x=\frac{8}{3}\ cm

6 0
2 years ago
If 3 apples costs 6 dollars how much would 12 apples cost proportions
Reptile [31]
6 divided by 3 = 2

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or...


3 apples x 4 = 12 apples

6 dollars x 4 = 24 dollars
7 0
3 years ago
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