In San Francisco, the tax on a property assessed at $510,000 is $7,140. If tax rates are proportional in this city, how much would the tax be on a property assessed at $810,000?
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10

step-by-step explanation:

the answer is  

a.

4,624π mm2

step-by-step explanation:

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0