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Tcecarenko [31]
3 years ago
6

What do I do I can't understand it my teacher stupid

Mathematics
1 answer:
denpristay [2]3 years ago
5 0
Make them all fractions over 4, so 3 would be 12/4, and 1 1/4 would be 5/4 so add them together 
12/4+5/4= 17/4 then divide by 4 to reduce it, to get 4 1/4
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Need help solving these two vector problems.
jonny [76]
<h3>Answer:</h3>

see below

<h3>Step-by-step explanation:</h3>

Here, we'll use an ordered pair <a, b> to represent each vector's two components. The rules are ...

  • multiplying a vector by a scalar multiplies each component by that scalar
  • multiplying a vector by a scalar multiplies its magnitude by the magnitude of the scalar
  • the magnitude of a vector is the square root of the sum of the squares of its components
<h2>1.</h2>

For A = <2.5, -3.5>, |A| = √(2.5²+(-3.5)²) = √18.5 ≈ 4.30

  • 2A = <5, -7>; |2A| = 8.60
  • -2A = <-5, 7>; |-2A| = 8.60
  • A/2 = <1.25, -1.75>; |A/2| = 2.15

_____

<h2>2.</h2>

A = |A|<cos(43.9°), sin(43.9°)>

B = |B|<cos(154.8°), sin(154.8°)>

C = <0, -25.8>

The sum being zero gives rise to 2 equations in 2 unknowns.

  |A|cos(43.9°) +|B|cos(154.8°) = 0

  |A|sin(43.9°) +|B|sin(154.8°) = 25.8

Using Cramer's rule to find the solution, we get ...

  |A| = 25.8cos(154.8°)/(cos(154.8°)sin(43.9°) -sin(154.8°)cos(43.9°))

  |A| = 25.8cos(154.8°)/sin(43.9° -154.8°)

  |A| ≈ 24.9887

  |B| = -25.8cos(43.9°)/sin(-110.9°)

  |B| ≈ 19.8995

4 0
3 years ago
Find the percent decrease. Round to the nearest percent. From 88°F to 64°F
lana [24]

Answer:

27.3

(it's actually ~27.27)

4 0
3 years ago
Can someone please help?
LuckyWell [14K]
Yes that’s the answer he’s right
6 0
3 years ago
If 2^(x+3) - 2x = k(2^x) what is the value of k
svlad2 [7]

Answer:

\large\boxed{C)\ 7}

Step-by-step explanation:

Use:

a^n\cdot a^m=a^{n+m}

2^{x+3}-2^x=2^x\cdot2^3-2^x=8\cdot2^x-2^x=(8-1)\cdot2^x=7\cdot2^x\\\\2^{x+3}-2^x=k(2^x)\\\\7\cdot2^x=k(2^x)\Rightarrow k=7

8\cdot2^x-2^x=8\cdot2^x-1\cdot2^x=(8-1)(2^x)=7\cdot2^x\\\\\text{distributive property:}\ a(b-c)=ab-ac

8 0
3 years ago
(x^-6)^4<br> Someone please help me :)
Anastasy [175]
The answer I came up with was ×^6-4. Just rewrite it. I hope this was helpful.
3 0
3 years ago
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