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3 years ago

21=35% of X Solve for X

Mathematics

2 answers:

Westkost [7]3 years ago

7 0

Answer:

Step-by-step explanation:

If 21 = 35%

x = 100%

cross multiplication

35x = 2100

x = 2100/35

x = 60

Olegator [25]3 years ago

4 0

Answer:

Step-by-step explanation:

X*0.35=21

X=21/0.35

X=60

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given y>0 and dy/dx=(3x^2+4x)/yif the point (1,√10) is on the graph relating x and y, then what is y when x=0

jonny [76]

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{3x^2+4x}y\iff y\,\mathrm dy=(3x^2+4x)\,\mathrm dx$
$\implies\displaystyle\int y\,\mathrm dy=\int(3x^2+4x)\,\mathrm dx$
$\implies \dfrac12y^2=x^3+2x^2+C$

When $x=1$ you have $y=\sqrt{10}$ , so

$\dfrac12(\sqrt{10})^2=1^3+2(1)^2+C\implies 5=1+2+C\implies C=2$

and so the particular solution to the ODE is

$\dfrac12y^2=x^3+2x^2+2$

Then when $x=0$ , you get

$\dfrac12y^2=0^3+2(0)^2+2=2$
$\implies y^2=4$
$\implies y=2$

where we omitted the negative root because it's given that $y>0$ .

4 0

3 years ago

Can someone help me? I know I'm doing something wrong but I'm not sure what.

Natasha2012 [34]

Answer:

Step-by-step explanation:

CI = 624 x 1.05 ^3 =722.358 for whole investment 722.36-624 =98.36 for interest only

or for interest only do 624 x .05^3 = 98.36

Standard interest is done like this

year 1 = 624 x 1.05 = 655.20

655.20-624 = 31.20

year 2 = 655.20 + 31.20 = 686.40

year 3 = 686.40 + 31.20 = 717.60

total interest = 717.60-624 = 93.60

So standard interest is the method you have done they may be asking for either compound interest which is the first one or asking for whole investment which means you need to also add 624 at end for Standard interest.

if you need CI interest do the top one.

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3 years ago

(x+4) (x+7) find product<br>

nataly862011 [7]

Answer:

x2+11x+28

Step-by-step explanation:

Thus, (x+7)(x+4) multiplies out to x2+4x+7x+28, which can be simplified to

x2+11x+28

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3 years ago

Read 2 more answers

Are these parallelograms or not?

Scrat [10]

Can’t see what you’re talking about

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3 years ago

Chris rents a car for a total of £375 The rental charges are £150 for the first day and £75 per day after that. For how many day

valkas [14]

Answer:

4 days in total

Step-by-step explanation:

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3 years ago