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Mariulka [41]
3 years ago
15

Andrea and her partner and writing a 12-page science report. They completed 25% of the report in class and 50% of the remaining

pages after school. how many pages do Andrea and her partner still have to write?
possible answers are 3.5, 4.5, 6, and 9.
Mathematics
1 answer:
Alex_Xolod [135]3 years ago
5 0
It can't be six because half of twelve is six and you've completed %75 so its 4.5 
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Find the missing endpoint if K is the midpoint of segment LM. L(-9, 4) and K(2, -1); Find M.
vampirchik [111]
M=(13;-2). If you have questions just message me. I hope this helps
3 0
3 years ago
a 40 gram sample of a substance that's used for drug research has a k-value of 0.1446. find the substance's half life in days
Novay_Z [31]

The applicable decay formula is:N = No*e^(-kt)WhereN = Mass left after time tNo = Original massk = constantt = half lifeUsing the values given,N/No = e^(-0.1446t) = 1/2ln (1/2) = -0.1446 t *ln e^1-0.6931 = -0.1446 tt = 0.6331/0.1446 = 4.79 daysTherefore, half-life is 4.8 days.

3 0
4 years ago
Read 2 more answers
The curves r1(t) = 4t, t2, t3 and r2(t) = sin(t), sin(5t), 2t intersect at the origin. find their angle of intersection, θ, corr
san4es73 [151]
First get the tangent vectors by differentiating r1 and r2 
r_1 '(t) = (4,2t,3t^2) \\  \\  r_2'(t) = (cos (t), 5 cos(5t), 2)
Evaluate at t=0
r_1' = (4,0,0) \\  \\ r_2' = (1,5,2)

Use identity for angle between 2 vectors:
u*v = |u| |v| cos \theta

Evaluate dot product and unit vectors:
u*v = (4,0,0)*(1,5,2) = 4 \\  \\ |u| = \sqrt{4^2 +0^2+0^2} = 4 \\  \\ |v| = \sqrt{1^2 + 5^2+2^2} = \sqrt{30}

Sub into identity and solve for theta:
4 = 4 \sqrt{30} cos \theta \\  \\ cos\theta = \frac{1}{\sqrt{30}} \\  \\ \theta = 79.48

Answer:
Angle of intersection is about 79 degrees.




5 0
4 years ago
What is it called when the variable dosnt have an answer?
maks197457 [2]

Hello.

The answer is : No soultion.

No solution would mean that there is no answer to the equation. It is impossible for the equation to be true no matter what value we assign to the variable.

Have a nice day

3 0
3 years ago
Read 2 more answers
Please help me! <br>10 points
Lerok [7]

the answer is d or the last one

5 0
3 years ago
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