1. False
2. False
...........
Answer:
Correct answer: t₂ = 70 minutes
Step-by-step explanation:
Given:
t₁ = 28 minutes and t₁₂ = 20 minutes, t₂ = ?
The necessary equation for this situation is:
1/t₁ + 1/t₂ = 1/t₁₂ => 1/28 + 1/t₂ = 1/20 => (28 + t₂)/ 28 t₂ = 1/20 =>
28 t₂ = (28 + t₂) · 20 = 20 t₂ + 560 => 28 t₂ - 20 t₂ = 560 =>
8 t₂ = 560 => t₂ = 560/8 = 70 minutes
t₂ = 70 minutes
God is with you!!!
Answer:
x = -1, y = 1
Step-by-step explanation:
To solve by elimination, first multiply x - 9y = -10 by 6 to get the same coefficient on x in each equation. Then subtract each like term.
6x - 54y = -60
6x - 3y = -9
-----------------------
-51y = -51
y = 1
Substitute y= 1 into one equation and solve for x.
x - 9y = -10
x -9(1) = -10
x - 9 = -10
x = -1
