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each month he spends  2190-450 dollars

and 

there are 12 months in a year so what do you think that you should do?

√300 + √108 =

$$\\\sqrt{100*3}+\sqrt{36*3}\\
=10\sqrt{3}+6\sqrt{3}\\
=16\sqrt3$$

p=3.5x-y what is the value of p when x=-12 and y=-6

p=3.5*x-y

p=3.5*-12- - 6                       3.5*-12= - 42

p=    -42    + 6

p= - 36

4G-3=3G+7

now solve for G

subtract 3b from both sides

subtract 2 from both sides

now it is finished   

376+12H=280+15H

a)   solve for H

b)   Once you have H you cansub it back into  376+12H  or into   280+15H    to find the cost of this job.

The 2 answers should be the same :) 

OR

 If 2x + 13 = 17, find the value of 3x + 1

2x=4

times both sides by 1.5

3x=6

3x+1=6+1=7

     500+  2.5% of 160000

=500 + 2.5/100*160000     dollars  

now you can do it on the calc on the home page

3(x + 1) = 7,

3x+3=7

3x=4

 If 3x - 13 = 8, find the value of x - 4.

there is more than one way to do this most people would solve fo x and then find x-4 but I want to be different

3x - 13 = 8

3x - 12-1 = 8

3(x-4) -1 =8

3(x-4)       = 9

x-4           =  9/3 = 3

find 7% of (165+204+188)     that will be his commission.

35*20=700feet

-x +6 > -1(2x +4)

-x+6  > -2x - 4

-x+6+2x  > -2x - 4+2x

x+6 >-4

x+6-6 >-4-6

x>-10

I am not sure what the question means but maybe.

these are successive numbers

-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,

  b                    c   d    a

2+-6+-1-0=2-6-1-0    =-5

7x + 10 - ( x+ 7 ) =

there is an invisable 1 between the minus sign and the backet.

7x + 10 - 1( x+ 7 ) =

Now the minus sign belongs to the 1

-1(x+7)=-1*x+-1*7 = -x-7

so   

   7x + 10 - ( x+ 7 )

=7x+10     -x-7

=7x-x   +10-7

=6x     +3

I think that this should be the roots of y=3x^2-10x+3

You need to solve  3x^2-10x+3=0

I would look for 2 numbers that multiply to 3*3=9  and add to -10

this is easy   -9 and -1

now replace the middle term -10x with -9x-1x

3x^2-9x-1x+3=0

now factorise in pairs

3x^2-9x     -1x+3=0

3x(x-3)      -1(x-3)=0

       (3x-1)(x-3)     =0

so     3x-1=0       or     x-3=0

            x = 1/3    or       x=3

Here is another post like this one

All the informations that you need are provided in the first answer, x=2 so the value of the equation 3x+1 is 7.

what is the least common denominator of 8,36, and 4 ?

 least common denominator     

four goes into both the others so I'm just going to consider 8 and 36

8=4*2

36=4*9

so I think it is 8*36/4 = 72

the value needed for this equation is what

b=1+r=1+0.04=1.04   

This is assuming that the interest is being earned and is being added to the account yearly.

Thanks Alan, I did think mine looked rather huge.  Can you see where my logic is floored?

Maybe this will help

https://www.khanacademy.org/math/arithmetic/fractions/div-fractions-fractions/v/dividing-fractions-example

The equation is 2x+13=17, find x:

Substract 13 on both sides:   2x=4

Divide by 2 on both sides:       x=2

(Check: if x=2, then 2x2+13=17)

Subsituting x=2 into the equation 3x+1 gives:

3x2+1=7

Thanks anon

You probably should do exponents before you do multiply.

remember PEDMAS

that is approx

$$\sqrt{\frac{7.89*10^7}{9.8^3*2}}
\approx\sqrt{\frac{8*10^7}{10^3*2}}
\approx \sqrt{4*10^4}
\approx 2*10^2
\approx 200$$