Exchange rate for rand is 7 for $1 how any dollars would u receive is u exchange 21 rand

$3

Step-by-step explanation:

7 rands for $1

7×3=21

21 rands for $3

5/6

step-by-step explanation:

if i remember correctly with perpendicular stuff you just take away the negative

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)