Which word in this sentence is a personal pronoun in the objective case we know two tour guides, and they gave us a tour themselves

The answer is us.

In the sentence "We know two guides, and they gaves a tour themselves.

Us is a personal pronoun in the objective case because it is the object of the verb gave: gave us

We is a personal pronoun, and is the subject of the verb know: We know

They is a personal pronoun and subject of the verb gave: they gave

Themselves is a pronoun used to emphasize the pronou they: they themselves.

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