You're trying to find constants

such that

. Equivalently, you're looking for the least-square solution to the following matrix equation.

To solve

, multiply both sides by the transpose of

, which introduces an invertible square matrix on the LHS.

Computing this, you'd find that

which means the first choice is correct.
Don't understand this either
Answer:
Angle C = 45 degrees.
Angle D = 30 degrees.
Step-by-step explanation:
Angle C = 45 + 90 = 135 180 - 135 = 45.
Angle D = 180 - 45 = 135 (angle F) 15 + 135 = 150 180 - 150 = 30
Hi there
Assets
house $250,000
car $18,000
piano $1,800
stock investments $3,000
checking account $1,700
Total assets. = $274,500
Liabilities
mortgage $150,000
car loans $6,000
Total liabilities = $156,000
Net worth
Assets - liabilities
274,500−156,000
=118,500
Hope it helps