1. Math (PreCalculus)

A spring with a weight attached is oscillating. The weight (which is attached at the bottom of the spring) is 5 feet from a 10-foot ceiling when it’s at rest. The motion of the weight can be described by the equation: y=3sin(pi*t - pi/2) , where y is the

2. science

how are relative dating and absolute dating different

3. physics

Two bodies of mass 3kg and 4kg are suspended at the ends of massless string passing over a frictionless pulley .the acceleration system is

4. geography

Following the breakup of the soviet union, 15 of its former republics became independent. 12 of these former republics formed the commonwealth of the independent states, largely in recognition of

5. precalc

The angle of elevation to the top of a building from a point on the ground 20 degrees and the angle of elevation from a point 25 feet farther away is 12 degrees. Find the height of the building. How would I begin to solve this problem? I do not know what

6. university bahrain

Q4. Many organizations find themselves in the apparently contradictory position of having high levels of financial investment in inventory, but at the same time frequently running out of stock of important components and materials.

7. physics

A golfer takes two putts to sink his ball in the hole once he is on the green. The ﬁrst putt displaces the ball 8.70 m east, and the second putt displaces it 6.04 m south. What displacement would put the ball in the hole in one putt? Answer in units of m

8. biology(really need help!)

What role does the lilac flower play in its natural ecosystem? What is its niche in the food web Are there any ecological issues surrounding the lilac flower(e.g. are its populations decreasing, is it spreading uncontrollably..)

9. maths

If lemon is divided into four equal parts then find the total surface area of one part of lemon

10. math

How many products do I have to sell at \$19.99 to make a billion dollars. please show me how you figured the problem out. Thank you and Happy Holiday

11. chemistry

Which alkyl halide should be used to prepare pent-2-ene and why?

12. math

find the two numbers that are twice as far from 15 as they are from 24

13. Math

Find the amplitude, frequency, and distance when t=3 a. y=-15cos((pi*t)/3)+5 b. y=120sin100pi*t I think the amp for a. is 15, the freq is 3/2 cycles per unit of time, and the distance is 20, but I'm not totally sure if I'm approaching this problem

14. Algebra

Find amplitude period and phase shift for F(x)=-3cos(4x+n)+6

15. english

Arrange the sentences logically. a. One day last week, I went next door to take some pictures of Coke and her newborn puppies. b. Only later did I learn that all animals are very protective of their young. c. Photographing pets can sometimes be a dangerous

16. binomial

expand (x+8y)^5 using the binomial theorem up to x^3. hence find the value of (1.08)^5 correct two decimal place.

17. Chemistry

What are the different ways to split a mixture of benzene and methanol into its constituents using a 2 phase system separation ?

18. algebra

The doctor want to know the effect of reducing blood pressure for a new medicine, chose 28 hypertensive patients to divide two groups randomly, one group as trial, another as control. the trial use the new medicine, the control use the standard medicine.

19. algebra 3

. A physician made a survey of the roundworm infection of a rural region in Hubei province in 1999. There were 68 infected among the 350 randomly sampled males, and 36 infected among the 250 females. (1). Please make a statistical table according to the

20. French

Which sentence is correct? Les chiens de filles sont gentils. Les chiens des filles sont gentils.

21. maths

I am fraction they say i m nt proper i may be improper but when u solve me u get number seven my number is 21.wht fraction am i?