Answer:
Step-by-step explanation:
(5y+4+3x)(5y+4-3x) = (5y+4)² - (3x)²......(from the difference of 2 squares )
by identity : (a+b)(a-b) = a² - b²
in this exercice ; a = 5y+4 and b = 3x
1 because he HAD 5 and if he gave his friend 4 than he has 1 left, 5-4=1 my friend.
Answer:
140 units²
Step-by-step explanation:
1/2bh=
1/2(15-5)(30-2)=
1/2 (10)(28)=140