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3 years ago

(3 - 13x - 7x^2) - (5x^2 + 12x - 10)

Mathematics

2 answers:

LekaFEV [45]3 years ago

8 0

Answer:−

1 out of 3−13x−7x2.−(7x2+13x−3)

Step-by-step explanation:

Tatiana [17]3 years ago

3 0

Answer:

Step-by-step explanation:

3 - 13x - 7x^2 - (5x^2 + 12x - 10) =

3 - 13x - 7x^2 - 5x^2 - 12x + 10 =

- 12x^2 - 25x + 13 <===

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I need help with only 4,8,10 and 12 I’m marking brainlest!

snow_tiger [21]

Answer:

4. $\frac{1}{6}$

8. $\frac{1}{2}$

10. $7\frac{3}{4}$ × $\frac{1}{3}$ = $7\frac{1}{4}$

I've answered 4, 8 and 10 for you as you haven't provided 12, but I hope this helps!! ^-^

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3 years ago

A friend bought 2 boxes and 8 notebooks for school, it cost him $11 He went back to the store the same day to buy school supplie

Marina86 [1]

Answer:

$5.25

Step-by-step explanation:

If the friend tripled the first purchase and subtracted twice the second purchase, he would have the cost of 3·8-2·5 = 14 notebooks. 7 notebooks would cost half that amount:

(3·$11 -2·11.25)/2 = $5.25 . . . . . cost of 7 notebooks

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3 years ago

Find the point (x,y)<br>on the line y = x that is equidistant from the points (-6,2) and (10,-9)

Nezavi [6.7K]

Answer:

(14.1, 14.1)

Step-by-step explanation:

If the point (x,y) is on the line y=x, then it has coordinates (x,x).

Find the distances from this point to points (-6,2) and (10,-9):

distance from (x,x) to (-6,2): $\sqrt{(x-(-6))^2+(x-2)^2}=\sqrt{(x+6)^2+(x-2)^2}$
distance from point (x,x) to (10,-9): $\sqrt{(x-10)^2+(x-(-9))^2}=\sqrt{(x-10)^2+(x+9)^2}$

Equate these distances:

$\sqrt{(x+6)^2+(x-2)^2}=\sqrt{(x-10)^2+(x+9)^2}$

Square this equation:

$(x+6)^2+(x-2)^2=(x-10)^2+(x+9)^2\\ \\x^2+12x+36+x^2-4x+4=x^2-20x+100+x^2+18x+81\\ \\8x+40=-2x+181\\ \\8x+2x=181-40\\ \\10x=141\\ \\x=14.1$

So, the coordinates are (14.1, 14.1)

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4 years ago

10 marbles are placed in a bag and two of them are randonly drawn.

Gelneren [198K]

The problem does not say anything about how many of the marbles are yellow but if you put the first one back in the bag then it is an independent probability and each one would be the same individual probability. Since the problem doesn't say and I don't know if you have it somewhere else, I'll do it as an example.

Let's say there were 6 of the 10 marbles were yellow. So the probability of the first one is 6/10 and so is the second one 6/10. To find the total probability you multiply them together 6/10*6/10=36/100=9/25

Hope that helps. If you can tell me how many yellow there are I will show the work for the specific problem.

4 0

3 years ago

the equivalent l- 12.5 equals 48.6 can be used to find the original length in centimeters of a wire before it was cut. What was

Alika [10]

Answer:

The Original length of the wire is 61.1 cm.

Step-by-step explanation:

Given:

$l-12.5=48.6$

Now it has been given that the above equation can be used to find the original length in centimeters of a wire before it was cut.

Also We need to find the original length of the wire.

From above equation we can say that;

l ⇒ Original length of the wire.

On Solving the above equation we get;

$l-12.5=48.6$

Now we will add both side by 12.5 using addition property of equality.

$l-12.5+12.5 =48.6+12.5\\\\l =61.1\ cm$

Hence the Original length of the wire is 61.1 cm.

8 0

4 years ago