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jasenka [17]
3 years ago
12

HELPPP plzzzzzz im so lost i hate math -.-

Mathematics
2 answers:
aksik [14]3 years ago
5 0
The answer is D I believe
maksim [4K]3 years ago
3 0

Answer:

C

Step-by-step explanation:

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Write the numbers in a standard form:<br><br> 57,900,000<br><br> 227,900,000<br><br> 1,427,000,000
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madarchud

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3 years ago
Learning Task 4. Solve the problem by applying the sum and product of roots
Delvig [45]

Answer:

<em>Thus, the dimensions of the metal plate are 10 dm and 8 dm.</em>

Step-by-step explanation:

For a quadratic equation:

x^2+bx+c=0

The sum of the roots is -b and the product is c. Note the leading coefficient is 1.

We know the perimeter of the rectangular metal plate is 36 dm and its area is 80 dm^2. Being L and W its dimensions, then:

P=2(L+W)=36

A=L.W=80

Note both formulas are closely related to the roots of the quadratic equation, we only need to adjust the data for the perimeter to be exactly the sum of L+W and not double of it.

Thus we use the semi perimeter instead as P/2=L+W=18

The quadratic equation is, then:

x^2-18x+80=0

Factoring by finding two numbers that add up to 18 and have a product of 80:

(x-10)(x-8)=0

The solutions to the equation are:

x=10, x=8

Thus, the dimensions of the metal plate are 10 dm and 8 dm.

6 0
3 years ago
Find the area of the composite figure below.<br> 6 9 <br> 15
CaHeK987 [17]

Answer:

180

Step-by-step explanation:

Triangle: 1/2BH

Square: BH

1. Split up the shapes

2. Use the area formula for square and triangle

Square area: 135

Triangle area: 45

3. Add

6 0
3 years ago
Which equation has a slope of -2 and passes through the point (3,-4)
RUDIKE [14]

Answer:

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7 0
3 years ago
16a + 7c^2 + 5 - 7a+c
umka21 [38]

Answer:

9a + 7c² + 5 + c

Step-by-step explanation:

16a +  {7}^{2}  + 5 - 7a + c

16a - 7a = (16 - 7)a = 9a

\boxed{\green{= 9a +  {7c}^{2}  + 5 + c}}

3 0
3 years ago
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