Fill in the blank: The direct object pronouns have to agree in with the noun it refers to.
number
gender
number and gender
the direct object pronoun remains unchanged

number and gender

Explanation:

Direct objects can be replaced by direct object pronouns (me, te, le, la, les, vous, nous) which agree in number and gender with the noun that is replaced.

Hope this helps!

Explanation:

For the problem, we should have same reynolds number

ρvd/mu = constant

1000×1×10⁻³×0.3×10⁻³/1.002×10⁻³ = 1400×0.5×d/600

d = 25.66 cm