Number = 42
50% of 42
= 50/100 × 42
= 21
Increased number = 42 + 21 = 63
Answer: 
Step-by-step explanation:
Height of the building AB= 443 meters
Distance between the building and the agent at the ground BC= 18 meters
Let x be the angle the agent should shoot his laser gun
Since ΔABC is a right triangle, then


Answer:
see explanation
Step-by-step explanation:
Given the width is
of the length, then
y - 4 =
(2y + 6)
Multiply through by 3 to clear the fraction
3y - 12 = 2y + 6 ( subtract 2y from both sides )
y - 12 = 6 ( add 12 to both sides )
y = 18
Thus
length = 2y + 6 = 2(18) + 6 = 36 + 6 = 42 in
width = y - 4 = 18 - 4 = 14 in
Answer:
Amount of Niobium-91 initially
= 300/91 =3.2967mol
2040 years = 3 ×680 = 3 half-lives
therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g
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