Find the value of x in the triangle shown

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000

Pranza plotted point a in the coordinate plane below.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?