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Aleksandr-060686 [28]

3 years ago

13

show how to multiply 6x298 using friendly numbers and then using properties and mental math.write about which method you like be

tter and why

1 answer:

Mnenie [13.5K]3 years ago

4 0

Multiply 300 times 5. you know that 3 times 5 equals 15. 15 plus 2 zeros is 1500. 1500 is the estimated answer

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Find the slope: (-4, 3) and (8, -3)

olga2289 [7]

Answer:

-1/2

Step-by-step explanation:

The slope is the change in y over the change in x.

$\frac{y_{2} -y_{1} }{x_{2} -x_{1} }$

For this question:

$\frac{3-(-3)}{-4-8} =\frac{6}{-12} =-\frac{1}{2}$

4 0

3 years ago

Read 2 more answers

A pharmaceutical company prefers experimental studies to conducting surveys or observational studies. what is most likely the re

never [62]

Pharmaceutical companies prefers experimental studies to conducting surveys and observational studies because companies can manipulate or suggest methods easily to have good outcomes and they are able to directly observe the results. Experimental studies is a type of study in which a procedure and method is intentionally introduced.

8 0

3 years ago

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I really don't understand why this question was deleted its not bad I don't know how to explain it

nalin [4]

Answer:

Step-by-step explanation:

Because it is a square root

8 0

3 years ago

Genrish500 [490]

Given

$a\sqrt{x+b}+c=d$

we have

$\sqrt{x+b}=\dfrac{d-c}{a}$

Squaring both sides, we have

$x+b=\dfrac{(d-c)^2}{a^2}$

And finally

$x=\dfrac{(d-c)^2}{a^2}-b$

Note that, when we square both sides, we have to assume that

$\dfrac{d-c}{a}>0$

because we're assuming that this fraction equals a square root, which is positive.

So, if that fraction is positive you'll actually have roots: choose

$a=1,\ b=0,\ c=2,\ d=6$

and you'll have

$\sqrt{x}+2=6 \iff \sqrt{x}=4 \iff x=16$

Which is a valid solution. If, instead, the fraction is negative, you'll have extraneous roots: choose

$a=1,\ b=0,\ c=10,\ d=4$

and you'll have

$\sqrt{x}+10=4 \iff \sqrt{x}=-6$

Squaring both sides (and here's the mistake!!) you'd have

$x=36$

which is not a solution for the equation, if we plug it in we have

$\sqrt{x}+10=4 \implies \sqrt{36}+10=4 \implies 6+10=4$

Which is clearly false

7 0

3 years ago

Graph the equation of the line for the equation , y = 3x-12

tamaranim1 [39]

Answer:

Step-by-step explanation:

3 0

3 years ago