The underlined digit is 3 wat the value of this number
285,003

step-by-step explanation: if she dances 25 minutes longer then runs she would have dance 25 more minutes of running and 30 minutes of dancing to add up to 55

the equation solved by kelsey is

⇒7 x-   →[given equation]

⇒ 7 x -1/2×(8 x)-1/2×(2)=6 →[distributive property]

⇒ 7 x- 4 x-1=6

⇒7 x- 4 x=6+1→ [ combining like terms]

⇒3 x=7 → [ subtraction and addition property of equality]

⇒x=7/3   →[ division property of equality]

so, we have used for properties to solve the equation

1. distributive property. 2. combine like terms. 3. subtraction and addition property of equality. 4. division property of equality.