# Posts by Jack

Total # Posts: 2,046

1. ### Maths

Out of 25 students 3 were absent. What percent of the students Were absent Were present
2. ### Physics

1. A concave spherical mirror has a radius of curvature of 29.4 cm. The object distance is 5.7 cm . Find the magnitude of the image distance. Answer in units of cm. 2. Find the magnification.
3. ### Language Arts

lmao ms sue dude why you so rude
4. ### Physics

plane’s sound detector perceives the horn’s sound, the plane has traveled a distance equal to one-half its altitude above the ocean. If it takes the sound 1.658 s to reach the plane, determine the altitude of the plane. The speed of sound is 343 m/s. Answer in units ...
5. ### Physics

The distance between two successive crests of a certain transverse wave is 1.10 m. 10 crests pass a given point along the direction of travel every 11.1 s. Calculate the wave speed. Answer in units of m/s.
6. ### science (physics)

if a car is driving on a flat road at a constant speed. the driver drives off a cliff which is 180 m above a river it lands in the river 90 m away (measured horizontally), how long does it take for it to land
7. ### Physics

In Young's experiment a mixture of orange light (611 nm) and blue light (471 nm) shines on the double slit. The centers of the first-order bright blue fringes lie at the outer edges of a screen that is located 0.452 m away from the slits. ...
8. ### Physics

The pupil of an eagle’s eye has a diameter of 6.0 mm. Two field mice are separated by 0.010 m. From a distance of 182 m, the eagle sees them as one unresolved object and dives toward them at a speed of 15 m/s. Assume that the eagle...
9. ### Physics

A 2.60-kg block is attached to a horizontal spring that has a spring constant of 214 N/m. At the instant when the displacement of the spring from its unstrained length is -0.115 m, what is the acceleration a of the object? In your answer, be sure to include the proper plus or ...
10. ### science

where does the Housatonic river in Connecticut originate and what is its base level?
11. ### SOCIAL STUDIES

Dejdudueieeiejejejejejdejdjdjdjfjfuffjchcjchcjcjccjjffjfjfjtfjiggjfjfjfififtitufu
12. ### Math

Eunice runs around an oval quarter-mile track, completing one lap every 2 minutes and 30 seconds. At this speed, how many seconds will it take him to run a mile?
13. ### marketing

Competitors that offer similar content to Motor Trend on Demand
14. ### English

I was wondering if anyone could give me an idea for this essay prompt? Describe a situation in which you have made a direct impact on the life of someone else. I just have no idea where to start or write about...
15. ### Science

1) What unit is speed measured in? 2) Why is it important to include units when describing motion? I've read this entire lesson. I just can't seem to find these answers.
16. ### Im very confused and need help- Language Arts

isabelle everthing is correct except for number 2 it is not b it is a
17. ### chem

How many moles of S are needed to combine with 0.208 mol Al to give Al2S3? break it down thanks
18. ### Math

all of you are wrong
19. ### Math

Do not listen to Rachel!! I got 9/19
20. ### mathematics

camine has 3 pieces of wire . the lenght 1st wire 5 meters the lenght of second wire is 3 meters less than tice the lenght of third wire . what is the peremeter of the triangle if the wires are connected end to end and the scond 9 meters long
21. ### math

Thanks Help is on the way with USA 100%
22. ### Math

How is log(base(x))x^m-1=1 My Answer Key says m-1+1=0 but I don't understand that solution
23. ### Feedback Control

The goal of this project is to model the longitudinal motion of a Segway and design a PID controller for it. The model must include the dynamics of the inverted pendulum on two wheels, as shown on Figure 1 (left), and the model of the DC motors (same as ) that actuate the ...
24. ### Math

solve the equation t/4=20
25. ### Math

it means that Elliot had double the amount of cards that Sam has. (Example Elliot had 12 cards and Sam had 24 cards)
26. ### Math

Elliot has twice as many trading cards as Sam. Elliot has 20 trading cards. write and equation and use it to determine the number of trading cards Sam has. a. s+2 = 20;18** b. s/2 = 20;40 c. 2s = 20;10 d. s-2=20;22
27. ### Math

Find the unit rate for a sponge cake that weighs 25 ounces and has 2750 calories. A. 0.009 calories per ounce B. 110 calories per ounce** C. 68,750 calories per ounce D. 115 calories per ounce
28. ### math

No that was not me. what is the link
29. ### math

50 is what percent of 13? Thanks

Ok

I got 23 ft.
32. ### Math

What would the height of the building be.

Thank You!
34. ### Math

kory is standing near a building that has a shadow that is 14 feet long. Kris is 5.5 feet tall, and the length of her shadow is 3.5 feet. set up and solve a proportion to determine the height of the building.

36. ### math

Tamika’s dad bought a Mustang convertible for 12,000 dollars to celebrate his first job in 1978, which paid him 15,000 dollars a year. If Tamika is to use the same fraction of her salary as her dad to buy a Mustang convertible, which now sells for 32,000 dollars, what ...

thats wrong
38. ### maths

Pedro earns 7.50 dollars an hour at his job at Matrix Cinemas. If he works 20 hours this week and his employer withholds a total of 22 percent of his weekly pay for taxes and Social Security, what is his take-home pay for the week?
39. ### Math

Hwan decides to lose weight before the wrestling season begins. He weighs 148 pounds now and loses one pound per week for six weeks. Let y represent Hwan’s weight and let x represent the time in weeks. What is the slope of the line? The y intercept is 148
40. ### Math

Wait so the slope is -x and y intercept is 148?
41. ### Math

Hwan decides to lose weight before the wrestling season begins. He weighs 148 pounds now and loses one pound per week for six weeks. Let y represent Hwan’s weight and let x represent the time in weeks. What is the slope of the line? What is the y intercept
42. ### stast

suppose the alternative hypothesis in a hypothesis test is "the population mean is less than 60" if the sample size is 50 and alpha =.05, the critical value of the z is?
43. ### Math

What is the next term in the sequence 81, 27, 3, 1, 1/3...
44. ### Math

Detemine the sequence as arithmetic, geometric, both or neither. 16,8,4,2,...
45. ### Science

Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens. A. Integumentary system B. Nervous system C. circulatory system D. endocrine system I think it is C
46. ### social studies

Thanks 100% :)
47. ### Math

Which proportion has cross products of 5*24 and 8*15? A. 5/8 = 15/24 B. 5/24 = 8/15 C. 8/24 = 15/5 D. 15/8 = 5/24
48. ### Math

Which ratio forms a proportion with 18/30? A. 20/35 B. 50/90 C. 36/48 D. 60/100
49. ### Math

Which Ratios for a proportion? A. 4/9,12/25 B. 3/7,18/42 C. 5/11,20/45 D. 5/8,15/25
50. ### Math

Which Ratios for a proportion? A. 4/9,12/25 B. 3/7,18/42 C. 5/11,20/45 D. 5/8,15/25 Which ratio forms a proportion with 18/30? A. 20/35 B. 50/90 C. 36/48 D. 60/100 Which proportion has cross products of 5*24 and 8*15? A. 5/8 = 15/24 B. 5/24 = 8/15 C. 8/24 = 15/5 D. 15/8 = 5/24...
51. ### Math

Convert the map scale to unit rate. How many inches represent one mile? Show Your work. Interpret the meaning of unit rate. 3/10 in. = 7/8 miles

Thanks
53. ### Math

286 miles in 5 1/2 hours
54. ### Math

Write the ratio as a unit rate

Ok thanks
56. ### Math

Write the ratio as a unit rate. 8 meters in 10 seconds. A. 0.8 meter per second B. 1.125 meters per second** C. 2 meters per second D. 80 meters per second

Thanks!
58. ### History

What was the 54 mile civil rights march called that was after bloody Sunday?
59. ### Math

an object is moving along the x-axis such that the position of the object in masters at time t in seconds is giving by the function x(t)=t^3-12t^2+36t-5, for 0<=t<=8 a- when is the object moving right? and when to the left? b- When is the object's velocity both ...

Thanks
61. ### Math

The cost in dollars of a class party is 59+13n, where n is the number of people attending. What is the cost for 44 people.

Thank You
63. ### Math

d+g/h for d =35, g = 19, and h=6
64. ### Math

How do i do this with and without distribution?

Thanks
66. ### Math

you want to buy three books that are on sale at 20% off. the original prices of the books are \$2.50, \$4.95, and \$6.00. How much will you save? Calculation With distribution. Calculation without distribution.

Thank You
68. ### History

Why was northern Italy a natural birthplace for the Renaissance?
69. ### algebra

George is starting a new streaming music service. For a monthly fee, you can stream 50 songs. There is an additional charge for each song over 50. In August, Bill was charged \$11.22 for 67 songs and in September he was charged \$13.50. Write a function for the total charge. ...
70. ### Math

These two are correct i just finished the quiz.
71. ### Math

a) y=4 b) m=5 Would this be correct
72. ### Math

Solve using metal math. a) 4y+3=19 b) 2+3m=17
73. ### Math

One of the sides is 5.8 but would the other side go in the place of z. that is what i thought.
74. ### Math

There are not given 2 sides to divide. What do you mean.
75. ### Math

Solve the equation 5.8 = z/2.2
76. ### Math

Thank you so much
77. ### Math

Solve the equation 2.8x = -9.24
78. ### Math

I solved this. It is 18
79. ### Math

What Value of x is a solution to the equation? x-2 = 16
80. ### Math

Write an algebraic expression for the sum of 3 Coins and c Coins
81. ### Math

Evaluate -5g-6 for g = -2

Thank You

1) -5g-6 for g = -2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x-2 = 16 4) use mental math to solve the equation. z/-12 = -5 5) estimate the solution of the equation x-8.1 = 5.3 to the nearest whole ...
84. ### Math

I know how to do these now thanks
85. ### Math

or how to do them
86. ### Math

I really just don't understand algebraic equations like these
87. ### Math

1) -5g-6 for g = -2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x-2 = 16 4) use mental math to solve the equation. z/-12 = -5 5) estimate the solution of the equation x-8.1 = 5.3 to the nearest whole ...
88. ### Math

-5g - 6 for g=-2
89. ### religion

they help and pray for the people in need
90. ### math / science

a bacteria population doubles every eight minutes. if the population begins with one cell how long will it take to grow to 512 cells?
91. ### pre calculus

ohhhhh, i see! thank you for making it simple to understand
92. ### pre calculus

Double Angle Formula. If the double angle formula for cos2(u) = 2cos^2(u)-1, then write the double angle formula for cos2(u) in terms of sine.
93. ### art

keeping facial features in proportion means
94. ### Math

The track at Coolidge Middle School is 14 of a mile long. It takes Melissa 1 minute and 40 seconds to run around the track. How many minutes will it take Melissa to run 3 miles?

The answer is D) Multicellular. Hope this helps.
96. ### physic

The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50 m in a straight line, reaching a final speed of 79 km/h. Determine the cheetah's average acceleration during the short sprint. m/s2
97. ### CHEMISTRY

2HBr+Mg(OH)2 -> MgBr2+2H2O how many mL of a 0.2 M HBr solution is required to react with 40 mL of a 0.40 M Mg(OH)2 solution
98. ### math

simplify 8/2 + 9 (12 divided by 3x2)-7 explain each of your steps i thought it was 1
99. ### math sequence

5th term for recursive sequence: a(1) = 1 a(n+1)=3a(n)-1
100. ### grammar

Is this correct? It is the waves, where... The "it is the waves" part. thanks
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