Step-by-step explanation:
60° + 80° + y = 180° ( being straight angle )
140° + y = 180°
y = 180° - 140°
y = 40°
A-b=21
5a-2b=18
We can use substitution here. Take the first equation and solve for A. (Picking this one because it's easy)
a = 21+b
Plugin to the second equation:5(21+b)-2b=18
Simplify: 105 + 5b - 2b = 18
Simplify: 105 + 3b = 18
Subtract both sides: 3b = 18-105
Simplify: 3b = -87
Divide: b = -29
Plug back into the first: a=21+b
a = 21 - 29
a = -8
Option D
A2 +b2= c2
a2 +25= 169
-25 -25
a2= 144
divide by the square root and
a= 12
Answer:
a rectangular prism/ rectangular plane
Step-by-step explanation:
Which of the following statements are true about line segments
Answer: that connect two endpoints
