Answer:
y = 50
Step-by-step explanation:
All triangle angles add up to 180 degrees.
To set this equation up, you need to add everything given in the triangle and set it equal to 180:
y + y + 80 = 180
<em><u>Add like terms:</u></em>
2y + 80 = 180
<u><em>Subtract 80 from both sides:</em></u>
2y + 80 = 180
- 80 - 80
___________
2y = 100
<u><em>Divide both sides by 2:</em></u>
y = 50
<u><em>If you're unsure, you can plug in the 50 for y:</em></u>
y + y + 80 = 180
50 + 50 + 80 = 180
100 + 80 = 180
180 = 180
Answer:
(2x+7)(x-1)
Step-by-step explanation:
2x²+5x-7
2x²+7x-2x-7
x(2x+7)-1(2x+7)
(2x+7)(x-1)
Answer:
The similar shortcut for division works because division is the opposite operation of multiplication—it “undoes” multiplication. If we move the decimal point to the right when multiplying by 10, 100, 1000 and so on, then it is quite natural that the rule for division would work the “opposite” way.
Step-by-step explanation:
If my math is right it would be y = 2x + 50<span>
</span>
Answer:
(i) Approximately 3 half lifes
(ii) 
Step-by-step explanation:
(i) ∵ The half life of Radon-222 is approximately 3.8 days,
So, the number of half life in 11.46 days = 
≈ 3
(ii) Since, the half life formula is,
Where,
= initial quantity,
t = number of periods
= half life of the quantity,
Given,
N = 
t = 11.46 days,
