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kipiarov [429]
3 years ago
12

Qs. If three masons construct a wall in.

Mathematics
1 answer:
nydimaria [60]3 years ago
5 0

Answer:

2.5 days

Step-by-step explanation:

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16x=224 please help
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2. Vectors u and v are given by: u=5i-4j+ pk v=2i+tj-3k (a) Express p in terms of t when u and v are perpendicular. ​
Sindrei [870]

If u and v are perpendicular, then their dot product is zero:

\vec u \cdot \vec v = (5\,\vec\imath-4\,\vec\jmath+p\,\vec k) \cdot (2\,\vec\imath+t\,\vec\jmath - 3\,\vec k) = 10 - 4t - 3p = 0

Solve for p :

10 - 4t - 3p = 0

3p = 10 - 4t

\boxed{p = \dfrac{10-4t}3}

6 0
2 years ago
If cosA = 3/5 and A ∈ (0,90), what is sin2A?
Hitman42 [59]

Answer:

\frac{24}{25}

Step-by-step explanation:

Given

cosA = \frac{3}{5} = \frac{adjacent}{hypotenuse}

Then the opposite side using Pythagorean triple is 4, thus

sinA = \frac{4}{5}

Using the trigonometric identity

sin2A = 2 sinAcosA, then

sin2A = 2 × \frac{4}{5} × \frac{3}{5}

         = \frac{2(4)(3)}{5(5)} = \frac{24}{25}

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4 years ago
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