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UNO [17]
2 years ago
8

I NEED HELP FAST PLEASE

Mathematics
1 answer:
Stells [14]2 years ago
8 0

Answer:

The second and fourth option

Step-by-step explanation:

In order for two lines to be perpendicular they must intercept each other and their slope must be the opposite inverse; ex: \frac{-1}{4}  the negative inverse is 4 (multiplying by -1 and flipping the fraction)

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Iodine-131, a radioactive substance that is effective in locating brain​ tumors, has a​ half-life of only 8 days. A hospital pur
Aloiza [94]

The mass of substance left after 7 days is 13.09 g

The mass of substance left, N is given by

N = N₀exp(-λt) where λ = decay constant and N₀ = initial mass of substance present = 24 g and t = time

Also, λ = 0.693/t' where t' = half-life of iodine = 8 days

So, λ = 0.693/t'

λ = 0.693/8

λ = 0.086625/day

Since the mass of substance left is N = N₀exp(-λt) and we require the mass of substance after t = 7 days,

N = N₀exp(-λt)

N = 24 gexp(-0.086625/day × 7 days)

N = 24 gexp(-0.606375)

N = 24 g × 0.5453

N = 13.09 g

So, the mass of substance left after 7 days is 13.09 g

Learn more about radioactive decay here:

brainly.com/question/23705307

7 0
3 years ago
need help please. Problem: Construct a triangle with interior angle measures of 45° and 45°. The third angle of the triangle is
REY [17]

The angles of a triangle add to 180 degrees so the remaining angle must be 90°.

This triangle is half a square. It's one of the two tired triangles of trig, the other being half an equilateral triangle, 30°/60°/90°.

4 0
3 years ago
Read 2 more answers
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tia_tia [17]

Answer:

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question 13 - $97,200

Step-by-step explanation:

I=prt

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3 years ago
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8 0
3 years ago
9. Reflect figure OPQR over the x-axis.
erastovalidia [21]

Answer:

9) P' will be at (-3, -6)

10) T' will be at (0, -1)

11) Quadrant IV

Step-by-step explanation:

9) point P is 3 units away from the y-axis and 6 units away from the x-axis; after reflecting over x-axis it will still be the same distances away from each axis but will be in a different quadrant

10) T is at (5, 6); if translated it will be at (5-5 , 6-7) or (0, -1)

11) a point or shape moves to a new quadrant every 90 degrees

5 0
3 years ago
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