i need help on my help on my homework.

the motor for a lift in a tall building uses 12000 watts of power .the lift and its passengers has a mass of 500kg the lift motor takes 10 seconds to rise the lift and its passengers through a height of 20 metres work out the efficiecy of the lift motor

PORis isosceles. its base PR=12cm. its altitude is 14cm. calculate the length of the equal sides.

ABCD is a kite whose diagonals cross at P.AP=1.5cm,AD=2.5cm andAB=1.7cm. calculate the length of the diagonals of the kite.

What is X over 5 equals 21 solve for X

i need help on 2 questions.

1) A ship leaves port and sails 74km north. It then turns and sails 68km east. Find the distance and the bearing of the shop from the port.

The second question is..

2) Solve this equation 4x(cubed)-7=23

please help!! would be very grateful! i think i know what to do.. but what i do doesn't seem to be working! i hope someone that is online could help me, please!..

a roll of tape can seal 200 panes of glass 40cm wide.how many panes at 50cm wide could it seal?

whats the answer to the shark is 142cm. long. The giant salmon is 1 metre and 11cm.long.How much longer is th shark than the salmon

gcse

Is this correct?

7.08-(3.65/5) =7.08-(0.73) =6.35

2/x-2=3x-4/x2-5x+6

8x+7=6x+9 8x+6x=7+9 14x=16 x=16-14 x=2

is this right ??

anna has up to 20 eggs she counted in fours had 3 left over she counted in fives had 4 left over how many eggs she got

Find what to multiply a quantity by to be equivalent to; a - an increase of 20% b - an increase of 6.25% c - a decrease of 35% d - a decrease of 1.5% THANKYOU VERY MUCH :-)

It takes Josh 12.5 minutes to climb a hill in the snow. It takes him ninety-one seconds to ride his sled down the hill. How much longer does it take him to climb the hill than to ride down it?

Thank you :)

A bag contains 3 black counters, 4 red counters and 5 blue counters. A counter is taken at random down the probability that it is a black or red counter.

The diagram below shows the path of a rocket which is fired into the air. The height, h metres, of the rocket after t seconds is given by h(t) = –2t(t – 14)

(a) For how many seconds is the rocket in flight? (b) What is the maximum height reached by the rocket?

please help, i would be very grateful!

A company makes large bags of crisps which contain 90 grams of fat. The company aims to reduce the fat content of the crisps by 50%. They decide to reduce the fat content by 20% each year. Will they have achieved their aim by the end of the 3rd year? Justify your answer.

I have tried really hard with this question, I just cant get it!

there are 15 bags of apples in a market. The mean no. of apples in each bag = 9

This table shows 14 bags:

NO. APPLES..... FREQUENCY 7........................... 2 8 ........................3 9 ...........................3 10 .......................4 11....................... 2

Calculate the no. of apples in the 15th bag!

PLEASE HELP ME D:

I AM REALLY STRUGLLING!

1. What are the main features that distinguish a cost benefit analysis from a financial analysis?

2. Why is a discount rate used in CBA and how should the level be determined?

3. ATTACHED

survey questions

exponential decay and finding the value of t when 40 = 80 x 2^-0.015t