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3 years ago

Y= 15x+55 Solve, please I am new, to this kinda stuff.

Mathematics

2 answers:

ZanzabumX [31]3 years ago

8 0

The slope is 15 & the y-intercept is (0,55)

11Alexandr11 [23.1K]3 years ago

7 0

Answer:

x=-11/3

Step-by-step explanation:

0=15x+55

-15x=55(Divide both sides)

x=-11/3

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antiseptic1488 [7]

Answer:

3/6 or 1/2 meter lomg.

Step-by-step explanation:

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3 years ago

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Solve the quadratic formula for (5x+3)(5x-3)=19X<br><br> Must show all workings

AfilCa [17]

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3 years ago

I have tryed to find this problem and I can't everytime I try the numbers that are to high for the answer what I'm I doing wrong

garri49 [273]

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1071/2

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4 years ago

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Two vertical poles of heights 60 ft and 80 ft stand on level ground, with their bases 100 ft apart. A cable that is stretched fr

Andreyy89

Answer:

Step-by-step explanation:

Given

height of two Poles are 60 and 80 ft

Distance between them is 100 ft

Let x be the distance of Pole of ht 80 ft from Point of stretch

thus length of rope is given by

$L=L_1+L_2$

$L_1=\sqrt{80^2+x^2}$

$L_2=\sqrt{60^2+(100-x)^2}$

$L=\sqrt{80^2+x^2}+\sqrt{60^2+(100-x)^2}$

differentiate w.r.t x we get

$\frac{\mathrm{d} L}{\mathrm{d} x}=\frac{2x}{2\sqrt{80^2+x^2}}-\frac{2\left ( 100-x\right )}{\sqrt{60^2+\left ( 100-2x\right )^2}}$

Put $\frac{\mathrm{d} L}{\mathrm{d} x}=0$ to get minimum value

$\frac{2x}{2\sqrt{80^2+x^2}}=\frac{2\left ( 100-x\right )}{\sqrt{60^2+\left ( 100-2x\right )^2}}$

squaring

$x^2\left ( (100-x)^2+60^2\right )=(100-x)^2(80^2+x^2)$

Rearranging

$28x^2-1800x+640000=0$

$x=\frac{400}{7}$

thus $L_1=98.312 ft$

$L_2=73.73 ft$

$L=172.04 ft$

7 0

3 years ago

In order to conduct an experiment five subjects are randomly selected from a group of 48 subjects how many different groups of f

exis [7]

Answer:

1,712,304 ways

Step-by-step explanation:

This problem bothers on combination

Since we are to select 5 subjects from a pool of 48 subjects, the number of ways this can be done is expressed as;

48C5 = 48!/(48-5)!5!

48C5 = 48!/43!5!

48C5 = 48×47×46×45×44×43!/43!5!

48C5 = 48×47×46×45×44/5!

48C5 = 205,476,480/120

48C5 = 1,712,304

Hence this can be done in 1,712,304ways

3 0

3 years ago