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3 years ago

X² – 7 y= X+6 Calculate the value of y given x= -2

Mathematics

1 answer:

hram777 [196]3 years ago

5 0

Answer:

y=0

Step-by-step explanation:

4-7y=-2+6

4-7y=4

-7y=0

y=0

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Which shows a difference of squares?<br> 1072-4x2<br> 1672 – x2<br> 8x2-40x+25<br> 64x2-48x +9

slava [35]

Answer:difference of two squares will be

16y^2 -x^2 = (4y -x)(4y +x)

so the second choice

Step-by-step explanation:

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3 years ago

The selling price of an item is $600. It is marked down by 10%, but this sale price is still marked up

Lena [83]

Step-by-step explanation:

Sale price

= Marked down by 10% from selling price

= 90% of selling price

= 0.9 * $600

= $540.

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3 years ago

Jack is mixing red paint with blue paint to make purple paint. he adds 2/5 of a fluid ounce of red to 11/15 of a fluid ounce of

Sedaia [141]

Answer:

Step-by-step explanation:

Change 2/5 to a decimal

2/5 = 0.4

Change 1 2/15 of a fluid ounce to a decimal.

1.133333

Set up your proportion.

0.4 / 1.133333 = x / 5 Cross multiply

0.4*5 = 1.133333*x

2 = 1.133333 x Divide by 1.1333333

2/1.33333 = x

x = 1.5 ounces.

He needs 1.5 ounces of red to make 5 ounces of purple.

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3 years ago

If the volume of the pyramid shown is 360 inches cubed, what is its height?

dimaraw [331]

Answer:

9 inches

Step-by-step explanation:

The formula for the volume of a rectangular pyramid is $V = \frac{1}{3}(l*w*h)$

Here we have volume (V), base (L), and width (W)
V = 360 in³, L = 12 in, W = 10 in

We need to manipulate the volume equation to solve for the height (H)

First we need to multiply both sides by 3 to get rid of the fraction: 3V = L×W×H
Then we need to divide both sides by (L×W) to get: $\frac{3V}{lw} =h$

Now we can plug in the given values:

$\frac{3(360in^{3}) }{(12 in)(10in)} =\frac{1080in^{3} }{120in^{2} } = 9in$
The height is 9 inches

4 0

4 years ago

A circle has a radius of 4m . find the length s of the arc intercepted by a central angle of 77° . do not round any intermediate

Hoochie [10]

$s= \pi r ( \frac{C}{180} ) \ \ \ \ [C= central \ angle, \ r=radius, \pi =3.14] \\ \\ s=3.14*4* \frac{77}{180}= 3.14* \frac{77}{45} \approx 5.4 \ m
$

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3 years ago