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leonid [27]
2 years ago
7

What is 2/9 simplified?

Mathematics
1 answer:
zavuch27 [327]2 years ago
4 0
2/9 is already simplified but it’s decimal form is
_
0.2
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A hospital prepares a 100mg supply of technetium-99m which has a half-life of 6 hours. what is the decay factor?
SashulF [63]
For a half- life, the formula is
A(t) = A0(0.5)^( t / t_0.5)
where A(t) is the amount of substance at time t
A0 is the initial amount of subtance
t_0.5 is the time it will reduce its amount to half
t is the time

substitute the given to the formula
A(t) = 100(0.5)^( t/6 )
so the decay factor is 0.5^( t/6 )
6 0
3 years ago
Gia bought a computer that was 20% off the regular price of $1,280. If a 9% sales tax was added to the cost of the computer, wha
garik1379 [7]
1280*.8=1024
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8 0
3 years ago
Read 2 more answers
Angles A and B are located in the first quadrant such that sinA= 7/25 and cosB = 5/13. Determine the exact value for cos (A-B).
fomenos

Answer:

  204/325

Step-by-step explanation:

You can work this a couple of ways. We expect you are probably expected to use trig identities.

  cos(A) = √(1 -sin²(A)) = 24/25

  sin(B) = √(1 -cos²(B)) = 12/13

cos(A -B) = cos(A)cos(B) +sin(A)sin(B) = (24/25)(5/13) +(7/25)(12/13)

  = (24·5 +7·12)/325

cos(A -B) = 204/325

__

The other way to work this is using inverse trig functions. It is necessary to carry the full calculator precision if you want an exact answer.

  cos(A -B) = cos(arcsin(7/25) -arccos(5/13)) = cos(16.2602° -67.3801°)

  = cos(-51.1199°) ≈ 0.62769230 . . . . (last 6 digits repeating)

The denominators of 25 and 13 suggest that the desired fraction will have a denominator of 25·13 = 325, so we can multiply this value by 325 to see what we get.

  325·cos(A-B) = 204

so, the exact value is ...

  cos(A -B) = 204/325

8 0
2 years ago
Given the function complete the chart f(x) = 4x+8
Annette [7]

Answer:

Slope: 4

y-intercept: 8

x ║ y

0    8

1    12

I hope this helped. Not 100% sure what you were looking for, though.


6 0
3 years ago
HELP 20POINTS WILLMARKBRAINLIEST!!
erastovalidia [21]

Answer:

2412

Step-by-step explanation:12*12*13=1872 15*12*3=540 1872+540=2412

7 0
3 years ago
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