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2 years ago

What is the value of y in the equation 6.4x + 2.8y = 44.4, when x = 3

Mathematics

2 answers:

Georgia [21]2 years ago

7 0

Answer:

Step-by-step explanation:

6.4(x)+2.8y=44.4

6.4(3)+2.8y=44.4

19.2+2.8y=44.4

2.8y=25.2

y=9

lara31 [8.8K]2 years ago

3 0

Answer:

y=9

Step-by-step explanation:

plus in the 3 into x and move the constant to the right. go ahead and calculate then divide by both sides. you should end up with y=9

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Find the sum: -11 + (-8)

Kipish [7]

Answer:

-19

Step-by-step explanation:

-11+(-8)

-11-8

-19

hole this is correct

3 0

1 year ago

Factor the equation in the picture

Sati [7]

Answer:

Step-by-step explanation:

4 x^ + 36=0

4x( x + 9) =0 provd

8 0

2 years ago

Krystal can wax a floor in 16 minutes. Perry helped her and it took 5.76 minutes. How long would it take perry to do it alone?

finlep [7]

Krystal's rate = 1 floor in 16 min. = 1/16 floors per min.

Working together their rate = 1 floor in 5.76 min. = 1/5.76 floors per min.

We need to determine Perry's rate, so we need to equate their combined rate with the sum of the individual rates.

Let Perry's time = x

In equation form, we can write:
1/16 + 1/x = 1/5.76
Solve for x:

(x+16)/16x = 1/5.76 -> 5.76(x+16) = 16x -> 10.24x = 92.16 -> x = 9

So, Perry would take 9 mins. to do the floor alone.

I hope this helped!
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8 0

2 years ago

Solve 3x2 = −12x − 15. x = −4 ± 2i x = −4 ± i x = −2 ± 2i x = −2 ± i

diamong [38]

ANSWER

$x = - 2 \pm i$

EXPLANATION

We use the method of completing the squares.

The equation is
$3 {x}^{2} = - 12x - 15$

We rewrite the above equation to obtain;

$3 {x}^{2} + 12x = - 15$

We divide through by 3 to obtain;

${x}^{2} + 4x = - 5$

We add half the coefficient of
$x$

to both sides of the equation to get,

${x}^{2} + 4x + {2}^{2} = - 5 + {2}^{2}$

The right hand side is now a perfect square.

${(x + 2)}^{2} = - 1$

We now take square root of both sides to get;

$x + 2 = \pm \sqrt{ - 1}$

We add -2 to both sides,

$x = - 2 \pm \sqrt{ - 1}$

We simplify to obtain,

$x = - 2 \pm i$

3 0

3 years ago

How much is 7 inches subtracted by 2/8

lbvjy [14]

That would be 6 and 6/8 inches

4 0

2 years ago