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1 year ago

How long will it take to shelf 860 books in five minutes? how long will it take in twenty minutes?

Mathematics

1 answer:

lilavasa [31]1 year ago

4 0

Answer:

20 minates the time was already given

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Do a two column proof! Given: AB = DC Prove: AC = DB please help!!!!!!!

scoundrel [369]

Answer:

answer is B

Step-by-step explanation:

hope dis help and if I may have brainly plz

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3 years ago

To the nearest hundred,what is the greatest whole number that rounds to the 2,500?the least whole number

Igoryamba

Greatest whole # 2549 Least whole # 2450

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3 years ago

I could really use some help on this one 1/2(b+14)=b+14÷2

konstantin123 [22]

B+14/2=b+14/2
1
they r equal

4 0

4 years ago

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If x = a sin α, cos β, y = b sin α.sin β and z = c cos α then (x²/a²) + (y²/b²) + (z²/c²) = ?

Oduvanchick [21]

$\large\underline{\sf{Solution-}}$

Given:

$\rm \longmapsto x = a \sin \alpha \cos \beta$

$\rm \longmapsto y = b \sin \alpha \sin \beta$

$\rm \longmapsto z = c\cos \alpha$

Therefore:

$\rm \longmapsto \dfrac{x}{a} = \sin \alpha \cos \beta$

$\rm \longmapsto \dfrac{y}{b} = \sin \alpha \sin \beta$

$\rm \longmapsto \dfrac{z}{c} = \cos \alpha$

Now:

$\rm = \dfrac{ {x}^{2} }{ {a}^{2}} + \dfrac{ {y}^{2} }{ {b}^{2} } + \dfrac{ {z}^{2} }{ {c}^{2} }$

$\rm = { \sin}^{2} \alpha \cos^{2} \beta + { \sin}^{2} \alpha \sin^{2} \beta + { \cos}^{2} \alpha$

$\rm = { \sin}^{2} \alpha (\cos^{2} \beta + \sin^{2} \beta )+ { \cos}^{2} \alpha$

$\rm = { \sin}^{2} \alpha \cdot1+ { \cos}^{2} \alpha$

$\rm = { \sin}^{2} \alpha + { \cos}^{2} \alpha$

$\rm = 1$

Therefore:

$\rm \longmapsto\dfrac{ {x}^{2} }{ {a}^{2}} + \dfrac{ {y}^{2} }{ {b}^{2} } + \dfrac{ {z}^{2} }{ {c}^{2} } = 1$

5 0

3 years ago

A certain triangle has two 45° angles. What type of triangle is it?

Lady bird [3.3K]

Answer:

Right isosceles triangle

Step-by-step explanation:

In Right isosceles triangle, two angles are acute and equal, while, the third angle is of 90°

8 0

3 years ago

Read 2 more answers