3 years ago

Given f(x) = -x - 3, find f(-6)

Mathematics

1 answer:

sweet-ann [11.9K]3 years ago

3 0

Answer:

plug in -6

-(-6) - 3

the 6 turns into a positive

subtract 3 from 6

= 3

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egoroff_w [7]

Bxh

14x15= 210
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3 years ago

D^2y/dx^2+4dy/dx-12y=cos2x

rjkz [21]

If you're solving for x, you'd move all the terms containing x to the left side of the equation:

d^2y/dx^2+4y/x-12y-cos^2(x)+sin^2(x)=0

If you're solving for y, you'd simplify both sides of the equation, then isolating the variable:

y=xcos(2x)

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4 years ago

Bob can paint a fence in 5 hours, and working with Jen, the two of them painted a fence in 2 hours. How long would it have taken

irakobra [83]

Answer: $\frac{10}{3}$

Step-by-step explanation:

Given

Bob can Paint a fence in 5 hr

so full job can be done in 5 hr

in 1 hr $\frac{1}{5}$ job is done

suppose Jen done the work in x hr

so in 1 hr $\frac{1}{x}$ part of job is done

Also if they combine they can do the job in 2 hr

so in 1 hr $\frac{1}{2}$

so $\frac{1}{5}+\frac{1}{x}=\frac{1}{2}$

$\frac{1}{x}=\frac{1}{2}-\frac{1}{5}$

$\frac{1}{x}=\frac{5-2}{10}$

$x=\frac{10}{3} hr$

3 0

3 years ago

Harrison says that to convert a mixed number to a fraction greater than 1, he thinks of it this way: 4 2/4=5/5+5/5+5/5+5/5+2/5=2

slamgirl [31]

Yes, Harrison's way doesn't work because 5/5 = 1 and 4 1's don't make 22/5

8 0

3 years ago

Kevin is planting 15 bushes and 9 trees in rows if he wants all the rows the same with no plants left over what is the greatest

Korvikt [17]

Answer:

he could do 6 row of 4, 8 rows of 3, 12 rows of 2

Step-by-step explanation:
15+9=24
6*4=24
8*3=24
12*2=24

7 0

3 years ago