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Alla [95]
3 years ago
13

Write the equation 0.3x 2 + 5x - 7 = 0 in standard form and then choose the value of "b."

Mathematics
2 answers:
spin [16.1K]3 years ago
7 0
The answer is b = 50.

The general form of quadratic equation is
ax² + bx + c = 0.

To write the equation 0.3x²<span> + 5x - 7 = 0 in standard form, you must get rid of decimals. To do that, multiply the equation by 10:
</span>10 * (0.3x²<span> + 5x - 7) = 10 * 0
</span>10 * 0.3x² + 10 * 5x - 10 * 7 = 0
3x² + 50x - 70 = 0

Now compare this equation with the general formula:
ax² + bx  +   c  = 0
3x² + 50x - 70 = 0

Therefore, b = 50.
dimulka [17.4K]3 years ago
7 0

Answer:

B is the answer

Step-by-step explanation:

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If the perimeter of the triangle is 32 cm what is the length of each two sides? Write and solve equation
scZoUnD [109]

Answer:

12 centimeters

Step-by-step explanation:

An isosceles triangle has two congruent sides which are legs(2 sides having same length )If x is length of each leg, then we ca write the equation like this

equation: x+x+8=32

combine like terms

2x +8 = 32

minus 8 from each side

2x=32-8

2x=24

divide both sides by 2

2x/2 = 24/2

x=12 centimeters

3 0
3 years ago
Solve for x: 2+3 (x+2x) = -2x(2-4) +1
Ronch [10]

Answer:

x = -1/5

Step-by-step explanation:

2+3 (x+2x) = -2x(2-4) +1

Combine like terms

2+3(3x) = -2x (-2) +1

Distribute

2+9x = 4x +1

Subtract 4x from each side

2+9x-4x = 4x+1-4x

2+5x = 1

Subtract 2 from each sdie

5x = 1-2

5x = -1

Divide by 5

5x/5 = -1/5

x = -1/5

7 0
3 years ago
The windows of a downtown office building are arranged so that each floor has 6 fewer windows than the floor below. If the groun
grigory [225]

Answer:

10

Step-by-step explanation:

This is an arithmetic sequence.  The common difference is -6, and the first term is 52.

a = 52 − 6(n − 1)

When n = 8:

a = 52 − 6(8 − 1)

a = 52 − 42

a = 10

5 0
3 years ago
The square of the sum of 7 times x and 3 divided by 4 times the difference of c and 1
bija089 [108]
The second answer from the top is correct. Your original choice is incorrect because the 7x and the 3 are not both being squared as the statement suggests.
7 0
3 years ago
Read 2 more answers
Factor the trinomial:<br><br> -2x²-16x-24
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-2x^2-16x-24&#10;&#10;
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-2x(x+6)-4(x+6)
(-2x-4)(x+6)
-2(x+2)(x+6)
8 0
3 years ago
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