Tenancy in common requires unity of:

Sasha is using a test model of her firm's new glow-in-the-dark nail polish to see if it works according to the design specifications. Sasha is involved in ____________

Fill in the blank(s) with the appropriate word(s).

It took 60 hours to make the first unit of a product. After the second and third units were made, the learning curve was estimated to be 80%. At $10 per hour, estimate the labor bill for the fourth unit

(Use at least three decimals in the exponent if you use the formula approach.) A) $400 or less B) from $400 to $420 C) from $420 to $440 D) from $1800 to $2000 E) over $2000