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prohojiy [21]
3 years ago
7

Name an angle of B) 50°

Mathematics
2 answers:
anygoal [31]3 years ago
6 0

Answer:

 ∠BFC = 50

Step-by-step explanation:

∠AFC = 90

∠AFB + ∠BFC = 90

40 + ∠BFC = 90

           ∠BFC = 90 - 40

          ∠BFC = 50

Pani-rosa [81]3 years ago
6 0

Answer: B-C

Step-by-step explanation:

I believe it is the angle of B-C becuase B-E is a strieght line which equals 180. Also EFD looks the same as AFB so it is 40. And DFC is 90 becuase of the square. So we take 180-40-90=50. And the only one that is not solved is B-C

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At 700 k, the rate constant for this reaction is 6.2 × 10–4 min–1. how many minutes are required for 10.0% of a sample of cyclop
Anna35 [415]

Answer:

170 min

Step-by-step explanation:

We know that there is a kinetics of the first order, which has the following equation:

ln ([A] t / [A] o) = -k * t

Solving for t:

t = - ln ([A] t / [A] o) / k

How we want to know is the time required with 10%, so [A] t / [A] o = 100% - 10%, that is, 90% = 0.9. We also know that k = 6.2 * (10 ^ -4)

Knowing this, we replace:

t = - ln (0.90) /6.2 * (10 ^ -4)

t = 170 min

Which means it will take 170 minutes.

8 0
3 years ago
A signalized intersection has a cycle length of 70 seconds. For one traffic movement, the displayed all-red time is set to 2 sec
Marina CMI [18]

Answer:

the displayed green time for the traffic movement is 30 seconds

Step-by-step explanation:

Given the data in the question;

Cycle length; C = 70 seconds

Displayed all-red time; AR = 2 seconds

Displayed yellow time; Y = 5 seconds

Effective red time; r = 37 seconds

total lost time per cycle; t_L = 4 seconds

the displayed green time for the traffic movement; G = ?

First we determine the Effective green time ( g );

Effective red time; r = Cycle length; C - Effective green time ( g )

so,

Effective green time ( g ) = C - r

we substitute

Effective green time ( g ) = 70 seconds - 37 seconds

Effective green time ( g ) = 33 seconds

Now,

Effective green time ( g ) = displayed green time; G + Displayed yellow time; Y + Displayed all-red time; AR - total lost time per cycle; t_L

i.e

g = G + Y + AR - t_L

we substitute

33 = G + 5 + 2 - 4

33 = G + 3

G = 33 - 3

G = 30 seconds

Therefore, the displayed green time for the traffic movement is 30 seconds

7 0
3 years ago
BRAINLIEST!!! PLEASE HELP..!!
amm1812

Answer:

2nd choice:

x int: 11/6

y int: 11/2

Step-by-step explanation:

put 6x + 2y = 11 into y = mx+b form to find y intercept. (b stands for the y int)

you get y = -3x + 11/2.

now you can graph with this.

plug 0 in for y and solve for x to find x int

0 = -3x + 11/2 then solve

7 0
3 years ago
Height of the Volleyball Serve
sveta [45]

Answer:  B)  The ball is 18 feet in the air after 1 second.

Step-by-step explanation:

Find the point on the graph where it hits the 1 second mark and find the value of y, 18 feet.

8 0
3 years ago
Calvin work as an air conditioning contractor the customer wants to buy an air condition for his family room his room measure 30
Verdich [7]
ANSWER

3840 {ft}^{3}

EXPLANATION

The room represents a rectangular prism or a cuboid.

The dimensions of the room are 30 feet by 16 feet by 8 feet(height).

The volume of a rectangular prism is

= base \: area \: \times \: height

Substitute the given values

= 30 \times 16 \times 8 {ft}^{3}

Simplify:

= 3840 {ft}^{3}

Hence the cubic feet of air in the room is 3,840ft³.
6 0
3 years ago
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