# Posts by mariel

Total # Posts: 30

math
From a square piece of cartolina with a side of 60cm, liza cut the biggest cross. What is the area of the cross?

Thermo
Calculate the equilibrium constant for the reaction NiO(s) + H2(g) → Ni(s) + H2O(g) at 1023K from the following data: Ni(s) + ½ O2(g) → NiO(s) ΔG0 = -244,555 + 98.53 T [J] H2(g) + ½ O2(g) → H2O(g) ΔG0 = -246,438 + 54.81 T [J] Could a ...

Calculus (math)
A group of engineers is building a parabolic satellite dish whose shape will be formed by rotating the curve y=ax2 about the y-axis. If the dish is to have a 8-foot diameter and a maximum depth of 2 feet, find the value of a and the surface area (in square feet) of the dish.

Calculus (math)
A painting in an art gallery has height h and is hung so its lower edge is a distance d above the eye of an observer (as in the figure). How far from the wall should the observer stand to get the best view? (In other words, where should the observer stand so as to maximize the...

Calculus (math)
A boat leaves a dock at 2:00 P.M. and travels due south at a speed of 15 km/h. Another boat has been heading due east at 20 km/h and reaches the same dock at 3:00 P.M. How many minutes past 2:00 P.M. were the boats closest together?

Calculus (math)
A conical water tank with vertex down has a radius of 12 feet at the top and is 23 feet high. If water flows into the tank at a rate of 20 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?

calculus
A lamp post 3m high is 6m from a wall. A 2m man tall is walking directly from the post toward at 2.5m/s. How fast is his 1.5 from the wall

Physics
The Angle of depression of Boat A from the top of a cliff which is 32 m high is 24 degree 15 minutes .The angle of depression of Boat B from the same point is 18 degree 12 minutes .Find distance between the two side with diagram

Math(angle of depression) i need help please..
hey can you explain please step by step i'm really sorry but i really need your help

Geometry
ABCD is a rectangle with B(-4,2) andD (10, 6). find the coordinates of A. Please help and tell me how you got it so I can understand

Geometry
Okay thank you do much!:)

Geometry
I'm sorry I put it wrong B(-4,6) c(-4,2) d(10,2)

Geometry
ABCD is a rectangle with B(-4,2) andD (10, 6). find the coordinates of A. Please help and tell me how you got it so I can understand

Geometry
Thank you so much, I understand this now! :)

Geometry
Show*

Geometry
Thank you but also how would I sow my work for this?

Geometry
Find the sum of the measures of the exterior angles of a convex 39-gon?

science
Consider the following reaction: CH3X + Y --> CH3Y + X At 25ºC, the following two experiments were run, yielding the following data: Experiment 1: [Y]0 = 3.0 M [CH3X] Time (hr) 7.08 x 10-3 M 1.0 4.52 x 10-3 M 1.5 2.23 x 10-3 M 2.3 4.76 x 10-4 M 4.0 8.44 x 10-5 M 5.7 2....

math
is one half greater than three fourths

physics
a light string 4 meters long is wrapped around a solid cylindrical spool with a radius of 0.075 m and a mass of .5 kg.a 5kg mass is then attached to the end of the string, causing the string to unwind from the spool. a. what is the angular acceleration of the spool? b. how ...

agebra
Sam and Chris went to “Lots O Fun” to play laser tag and video games for Chris’s birthday. Sam played 3 games of laser tag, 5 video games, and spent $17 total. Chris played 4 games of laser tag, 7 video games, and spent$23 total. How much does one video game ...

Physics
Find th resultant and speed direction of the airplane relative to the ground.... AN airplane is heading west at velocity 950km/hr and wind is blowing northward at velocity of 55.o km/hr

Calculus
64π

precal
find positive and negative coterminal angle for 55(pi)/18

Statistics
I do not understand what I need to do her I need some help.

science
true or false? the graph distance versus time for n object moving at consatant speed is a curve.

math
Solve the following algebraically. Trial and error is not an appropriate method of solution. You must show all of your work and write answers in rational form. 3 x + 7 = 9 Answer: x = 2/3 Show your work here: 3 x + 7 = 9 -7 - 7 3/3 x = 2/3 X = 2/3 b) Answer: x= -2 Show your ...

algebra
Solve the following algebraically. Trial and error is not an appropriate method of solution. You must show all of your work and write answers in rational form. 3 x + 7 = 9 Answer: x = 2/3 Show your work here: 3 x + 7 = 9 -7 - 7 3/3 x = 2/3 X = 2/3 b) Answer: x= -2 Show your ...

HELLLPPPPPPPP!!!!!!
48 pieces of apples