2 diamond rings and 4 silver rings cost $1300. A diamond ring and a silver ring cost $510. How much is a diamond ring?

370

Step-by-step explanation:

510 times 2 is 1020 - cost for 2 diamond and 2 silver

1300-1020 is 280 - cost for remaining 2 silver

280 divided by 2 = 140 - cost for each silver

510-140 is cost for 1 dimond = 370

$370

Step-by-step explanation:

(D-Diamond rings S-Silver Rings)

2D + 4S = $1300

D + S = $510

2D+4(510-D)=1300

2D+2040-4D=1300

2040-2D=1300

-2D=1300-2040

-2D=-740

D=370

510-370=140

S=140

Diamond Ring - $370

Silver Ring - $140

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step-by-step explanation:

9-15%

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1