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3 years ago

PLEASE HELP! FIRST AND BEST ANSWER WILL BE MARKED BRAINLIST!! second sections

Mathematics

1 answer:

Vika [28.1K]3 years ago

3 0

Answer:

Well, for one thing I can't read the image--it's too small!

But I know these problems well. If I am correct, this is a spinner probability problem.

Your spinner appears to have 5 sectors, all equal in area, therefore making their probability equal.

So each of those has a prob of 1/5 in the scheme of things.

To find the combonational probability below, multiply the prob of each outcome together to find each.

Have a great day, and feel free to comment with questions!

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HELP FOR BRAINIEST AND 50 POINTS

motikmotik

X - speed of the current
40+x - speed with current
40-x - speed against current

t-time
(40+x)*t=100
(40-x)*t=60

40t+xt=100
 + 40t-xt = 60
 80t =160
t = 2

40t+xt=100,
40*2+2x=100
80+2x=100
2x=100-80
2x=20
x=10 mi/h

10 mi/h speed of the current.

7 0

4 years ago

Read 2 more answers

Write a linear function with the values f(0) = 5 and f(-3) = 6

Elan Coil [88]

Answer:

You are given two points, (0,6) and (3,-3), so use the two-point formula for the equation of a line:

y - y1 = ( (y2 - y1) / (x2 - x1) ) (x - x1)

y - 6 = ( -9 / 3 ) (x - 0)

y - 6 = -3x

y = -3x + 6 This is: y = mx+b

Step-by-step explanation:

hope this will help you..

3 0

3 years ago

Adan can do a piece of work in 3 days, Bernie in 4 days, and Cynthia in 6 days each working alone.

Luda [366]

Answer:

1 day and 8 hours

Step-by-step explanation:

Adan does 1/3 work each day,

Bernie does 1/4 work each day, and

Cynthia does 1/6 work each day

combined they accomplish 3/4 each day

therefore it would take them 1 day and 8 hours

3 0

4 years ago

Solve the following by elimination method 11x+15y+23=0 and 7x-2y-20=0

mr Goodwill [35]

Let 11x + 15y + 23 = 0 be equation (1)
And 7x - 2y - 20 = 0 be equation (2)

Multiply equation (1) by 2:
22x + 30y + 46 = 0

Multiply equation (2) by 15:
105x - 30y - 300 = 0

Add equations (1) and (2):
22x + 105x + 30y - 30y + 46 - 300 = 0
127x - 254 = 0
127x = 254
x = 254/127
[x = 2]

Substitute x = 2 in equation (1) to find y:
11(2) + 15y + 23 = 0
22 + 15y + 23 = 0
15y + 45 = 0
15y = -45
y = -45/15
y = -3

Therefore, x = 2 and y = -3.

7 0

4 years ago

BRAINLIEST! HELP! Please help me! I NEED PART D AND E! I’m so lost :(

Zinaida [17]

Part A

Given:

Volume of square pyramid = 73.5 cubic inches

height of square pyramid = 4.5 inches

To find:

1)Side length of square pyramid.

2)if side length of square pyramid is rational or irrational

Steps:

1) Side length = $\sqrt{\frac{3v}{h} }$

Side length = $\sqrt{\frac{3*73.5}{4.5} }$

Side length = $\sqrt{\frac{3*73.5*10}{4.5*10} }$ (multiplying both sides to make it a whole number)

Side length = $\sqrt{\frac{3*735}{45} }$

Side length = $\sqrt{\frac{735}{15} }$ (3 gets canceled out)

Side length = $\sqrt{49}$

Side length = 7 inches

Therefore, the side length of the square pyramid is 7 inches long

2) 7 is a rational number, so the side length of the square pyramid is a rational number.

It is a rational number because,

it can be written in the form p/q, where

1) q $\neq$ 0

2) p and q are co-prime

3) p and q are integers

Part B

Given:

Volume of Khafre's pyramid = 9/10 of Khufu's pyramid's volume

Volume of Kristina's first pyramid = 73.5 cubic inches

To find:

Volume of Kristina's second pyramid

Steps:

Volume of Kristina's second pyramid = 9/10 the volume of Kristina first pyramid

Volume of second pyramid = $\frac{9}{10}*73.5$

Volume of second pyramid = 9 $*$ 7.35

Volume of second pyramid = 66.15 cubic inches

The volume of the second pyramid should be 66.15 cubic inches

Part C

Given:

Height of pyramid = 4.41 inches

Volume of pyramid = 66.15 cubic inches

To find:

1) Side length of pyramid

2) if the side length is rational or irrational

Steps:

1) Side length = $\sqrt{\frac{3v}{h} }$

Side length = $\sqrt{\frac{3*66.15}{4.41} }$

Side length = $\sqrt{\frac{3*66.15*100}{4.41*100} }$ (multiplying both sides to make it a whole number)

Side length = $\sqrt{\frac{3*6615}{441} }$

Side length = $\sqrt{\frac{6615}{147} }$ (3 gets canceled)

Side length = $\sqrt{45}$

Side length of pyramid is $\sqrt{45}$ inches

2) $\sqrt{45}$ cant be written in the form of a fraction, so it is an irrational number

(if u want i can explain this more)

Part D

Given

Height of model pyramid = 4.5 inches

Height of Khufu's pyramid = 755.75 feet (had to search the internet for the answer, so I am not sure if it is correct)

Side length of model pyramid = 7 inches

Side length of Khufu's pyramid = 481.4 feet (had to search the internet for the answer)

To find:

1)If the model is to scale with Khufu's pyramid

2) If the model is close to scale with Khufu's pyramid

Steps:

1) First lets find the ratio of the height to the side length of the model

Ratio = 4.5 in : 7 in

= 45 : 70

= 9 : 14

= 0.6428

Now lets find the ratio of the height to the side length of Khufu's pyramid

Ratio = 481.4 feet : 755.75 feet

= 5776.8 in : 9069 in

= 0.6369

Therefore the model is not to scale with Khufu's pyramid

2) Yes the scale is close

Part E

Given:

Height of model pyramid = 4.41 inches

Height of Khafre's pyramid = 448 feet

Side length of model pyramid = $\sqrt{45}$ inches

Side length of Khafre's pyramid = 706 feet

To find:

1) If the model is to scale with Khafre's pyramid

2) If the model is close to scale with Khafre's pyramid

Steps:

1) First lets find the ratio of the height to the side length of the model pyramid,

Ratio = 4.41 in : $\sqrt{45}$ in

= 4.41 : 6.7082

= 0.6574

Now lets find the ratio of the height to the side length of Khafre's pyramid

Ratio = 448 ft : 706 ft

= 5376 in : 8472 in

= 0.6345

Therefore the model is not to scale with Khafre's pyramid

2) No, the model is not close to scale, (it depends by what is meant by close, for me its 0.01)

Happy to help, and I hope you learnt something from this answer that will help you in the future

If you didn't understand any topic pls ask

3 0

3 years ago