Answer:
see explanation
Step-by-step explanation:
Given matrix A = , then
detA = ad - bc
Given
A =
detA = 5a - (a + 1) = 5a - a - 1 = 4a - 1
and
4a - 1 = 7 ( add 1 to both sides )
4a = 8 ( divide both sides by 4 )
a = 2
Thus
A =
A² - 7A + 7I
A² =
= =
7A= 7 = =
7I = 7 =
Thus
- +
= =
Hence
7A² - 7A + 7I = 0
Answer:
Each latte is 4.50
Step-by-step explanation:
45-18=27
27/6= 4.5
Answer: its e
Step-by-step explanation:
Answer:
Hemisphere Formulas in terms of radius r:
Volume of a hemisphere: V = (2/3)πr.
Step-by-step explanation: