If x is the length of one side of the painting what equation can you set up to find the length of a side?

This equation has 2 solutions, namely x = ±√400 = +20 or -20  

The negative solution does not make sense because a length cannot be less than 0.  

The total length needed to go around the painting is the perimeter of the square, which is  

P = 4*x = 4*20 = 80 inches  

this is the answer , p = 1 + (1/10)x

step-by-step explanation:

we have,

at sea level pressure is 1 atmosphere (i.e at x =0, p0=1 atmosphere)

at depth 23 meters , pressure = 3.3 atmosphere

since the pressure increases at constant rate as the depth increases, so we can write a relation as:

p =p0 +   kx   , where p is the pressure  , p0 is the initial pressure, x is the depth and k is constant rate of increasing.

to find constant rate k, plug p = 3.3 , p0 = 1 and x= 23 meters

we get,

  3.3 = 1 + k * 23

k = 2.3 / 23   = 1/10

so we can write the function formula as:   p = 1 + (1/10)x