標題:
MATHS~急~
發問:
1) After driving X hours at a speed of 40 km/h and y hours at a speed of 60 km/h, Peter covers a total distance of 1800km. If he drives back along the same road to the starting point at an average speed of 50 km/h, the time required will be 2 hours shorter than the time taken in his forward journey. Find the... 顯示更多 1) After driving X hours at a speed of 40 km/h and y hours at a speed of 60 km/h, Peter covers a total distance of 1800km. If he drives back along the same road to the starting point at an average speed of 50 km/h, the time required will be 2 hours shorter than the time taken in his forward journey. Find the values of x and y. 2)Miss Chow deposits $30000 in a bank and the interest is compounded yearly. After 3 years, she receives an amount of $37791.36. Find the annual interest rate. 3)It is given that the distance between P(a,-2) and Q(-1,1) is 5 units, where a>0. Find the value of a. 4)It is given that the coordinates of P and R are (-7,-12) and (5,3) respectively. Q is a point on the x-axis such that the slope of PQ is triple that of QR. Find the coordinates of Q. 5)In the figure, A(2,7), B(-4,-5) and C(p,q) are the vertices of a triangle. Mand N are points on the x-axis and the y-axis respectively such that AM:MC=1:1 and BN:NC=2:3. Find the coordinates of (a)C (b)M and N
最佳解答:
1)40x+60y=1800....1 x+y-2=1800/50 x+y=38......2 From2,x=38-y Sub x=38-y into 1, 1520-40y+60y=1800 y=14 x=24 2)8%......30000*(100+x)^3/1000000=37791.63 ==there is more 2009-09-03 19:53:04 補充： 3)a=-3 ..............3^2+4^2=5^2(Pyth.theorem)
其他解答:
MATHS~急~
發問:
1) After driving X hours at a speed of 40 km/h and y hours at a speed of 60 km/h, Peter covers a total distance of 1800km. If he drives back along the same road to the starting point at an average speed of 50 km/h, the time required will be 2 hours shorter than the time taken in his forward journey. Find the... 顯示更多 1) After driving X hours at a speed of 40 km/h and y hours at a speed of 60 km/h, Peter covers a total distance of 1800km. If he drives back along the same road to the starting point at an average speed of 50 km/h, the time required will be 2 hours shorter than the time taken in his forward journey. Find the values of x and y. 2)Miss Chow deposits $30000 in a bank and the interest is compounded yearly. After 3 years, she receives an amount of $37791.36. Find the annual interest rate. 3)It is given that the distance between P(a,-2) and Q(-1,1) is 5 units, where a>0. Find the value of a. 4)It is given that the coordinates of P and R are (-7,-12) and (5,3) respectively. Q is a point on the x-axis such that the slope of PQ is triple that of QR. Find the coordinates of Q. 5)In the figure, A(2,7), B(-4,-5) and C(p,q) are the vertices of a triangle. Mand N are points on the x-axis and the y-axis respectively such that AM:MC=1:1 and BN:NC=2:3. Find the coordinates of (a)C (b)M and N
最佳解答:
1)40x+60y=1800....1 x+y-2=1800/50 x+y=38......2 From2,x=38-y Sub x=38-y into 1, 1520-40y+60y=1800 y=14 x=24 2)8%......30000*(100+x)^3/1000000=37791.63 ==there is more 2009-09-03 19:53:04 補充： 3)a=-3 ..............3^2+4^2=5^2(Pyth.theorem)
其他解答:
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