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SCORPION-xisa [38]
3 years ago
14

Evaluate 2(5 + x2) + y if x = 3 and y = 2

Mathematics
1 answer:
photoshop1234 [79]3 years ago
8 0

Answer:

26

Step-by-step explanation:

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Sandy plays tennis once every 6 six days. Jim plays once every 8 eight days. If
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Answer:

they will play together again in 28 days

Step-by-step explanation:

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3 years ago
Consider the equation LaTeX: pN=kVT p N = k V T , where k is a constant. Select all of the correct answers that describe the var
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Answer: did u ever get the right answer?

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What is the ratio of the number of days in the week that do not begin with the letter "T" to the number of days in the week that
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Answer: 5:2

Thursday and Tuesday start with t

Monday, Wednesday, Friday, Saturday, and Sunday do not.

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7 0
3 years ago
Write an equation of the line that is perpendicular to 3x + 9y = 7 and passes through the point (6, 4)
andrezito [222]
The perpendicular line will have the x and y coefficients swapped and one of them negated. We can write the desired line as
  9(x -6) -3(y -4) = 0
where the coordinates of the point of interest are (6, 4).
Dividing by 3, this is
  3(x -6) -(y -4) = 0
  3x -y = 14

An equation for the line of interest is ...
  3x -y = 14

8 0
3 years ago
Read 2 more answers
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
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