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2 years ago

I rlly need help on this

Mathematics

2 answers:

rusak2 [61]2 years ago

8 0

Answer: 130, sorry if its wrong

Step-by-step explanation:

8 x 5 = 40 --> 40 x 3 1/4 = 130

mestny [16]2 years ago

5 0

Answer:

130 in.

Step-by-step explanation:

you can do it 3 ways

5x8=40 40x3 1/4=130

8x3 1/4=26 26x5=130

5x3 1/4=16 1/4 16 1/4x8=130

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maksim [4K]

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So,
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6 0

3 years ago

SOMEONE WORK THIS OUT FOR ME 50PTS!!

Kitty [74]

Answer:

How bout no-_-

Step-by-step explanation:

You not smart

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2 years ago

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What is the length of diagonal BD in rectangle ABCD if BC=5 and CD=8.

svetlana [45]

I hope this helps you

6 0

2 years ago

1/3(12x-24)=16 answer

mafiozo [28]

Answer:

x = 6

Step-by-step explanation:

4 0

3 years ago

Find a formula for the sum S of the solutions of the quadratic equation ax²+bx+c=0 .

Deffense [45]

Answer:

$S = -\frac{b}{a}$

Step-by-step explanation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = (x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

In this problem, the sum S of the solutions of a quadratic equation is:

$S = x_{1} + x_{2}$

$S = \frac{-b + \sqrt{\bigtriangleup}}{2*a} + \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

They have the same denominators, so we can keep the denominators and sum the numerators.

$S = \frac{-b + \sqrt{\bigtriangleup} - b - \sqrt{\bigtriangleup}}{2a}$

$S = \frac{-2b}{2a}$

$S = -\frac{b}{a}$

8 0

3 years ago