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2 years ago

Convert 45 minutes to seconds. There are seconds in 45 minutes (Simplify your answer.) how many seconds are in 45 minutes

Mathematics

1 answer:

nikitadnepr [17]2 years ago

6 0

answer:2700sec

Step-by-step explanation:

if 60 sec=min

therefore;60×45

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What is the surface area of this shape?

Talja [164]

Answer:

SA: 1575.2m

Step-by-step explanation:

(22)(22) + (26)(22) + (23.6)(22) =

484 + 572 + 519.2 =

1575.2

4 0

2 years ago

Select all the correct answers. Which vectors are unit vectors?

Ahat [919]

Answer:

Step-by-step explanation:

$(-\frac{1}{3} \sqrt{\frac{7}{2} } )^2+(\frac{1}{3} \sqrt{\frac{13}{2} } )^2\\=\frac{1}{9} (\frac{7}{2} +\frac{13}{2} )\\=\frac{1}{9} (\frac{7+13}{2} )\\=\frac{1}{9} \times10\\=\frac{10}{9} \neq 1$

not a unit vector.

$(\frac{1}{\sqrt{3} } )^2+(-\sqrt{\frac{2}{3} } )^2\\=\frac{1}{3} +\frac{2}{3} \\=\frac{1+2}{3} \\=\frac{3}{3} \\=1$

it is a unit vector.

$(\frac{1}{2} \sqrt{\frac{5}{3} } )^2+(-\frac{1}{2} \sqrt{\frac{7}{3} } )^2\\=\frac{1}{4} (\frac{5}{3} +\frac{7}{3} )\\=\frac{1}{4} (\frac{5+7}{3} )\\=\frac{1}{4} (\frac{12}{3} )\\=\frac{1}{4} (4)\\=1$

it is a unit vector.

$(\frac{3}{\sqrt{7} } )^2+(-\frac{2}{\sqrt{7} } )^2\\=\frac{9}{7} +\frac{4}{7} \\=\frac{9+4}{7} \\=\frac{13}{7} \neq 1$

it is not a unit vector.

6 0

3 years ago

2x + y = 10

Elza [17]

Answer:

3x - y = 5

Step-by-step explanation:

2x + y = 10 | ×2

x - 2y = -5

4x + 2y = 20

x - 2y = -5

add

4x + x + 2y - 2y = 20 - 5

5x = 15

x = 15 : 5

x = 3

replace x

4(3) + 2y = 20

12 + 2y = 20

2y = 8

y = 8 : 2

y = 4

3x - y =

= 3(3) - 4

= 9 - 4

= 5

8 0

3 years ago

6 builders can build 10 houses. How many number of houses can 18 builders build?

rewona [7]

Answer:6 x 30 =18 x ex

180= 18 ex

ex =180/18

number of days = 10

Step-by-step explanation:

3 0

3 years ago

Help meh fvghdbskjwdjcbhfvdcbjskalm

Rainbow [258]

Answer:

Step-by-step explanation:

Proportional relationships go through the origin on the graph so we can eliminate A and B. Also the x and y coordinates have the same ratio so the answer is D because 2:3 = 4:6 = 8:12 = 12:18.

8 0

3 years ago