# Posts by alyshan

Total # Posts: 7

**mathematics**

a boat travels 12 km upstream and back in 1 hour and 45 min.if the speed of the current is 3 km/h throughout,find the speed of the boat in still water,giving your answer correct to 3 decimal place. NOTE:(Answer is 14.3 km/h,so can any one show me the solution).

**geometry**

- IT would be sumthing like that (x-3)^2 + (y+5)^2 = 9 - opening the brackets by (a + b)^2 { A^2 + 2(a)(b) + b^2 ) - (x^2 - 6x + 9)+(y^2 + 10y + 25)=9 - nOw apply quadratic formula - Put the value in the above equation and find the value of x and y

**English (Grammar)**

Comma is use after 'or' or any pause. Writeacher is right.

**math**

- we will divide the percentage by 100 - {10.5/100}=0.105 - so $18,500 x 0.105 = $1942.5 - $1942.5 is MR.JERRY'S new raise so we will add his salary with his new raise - $18,500 + $1942.5 = $20442.5 ANSWER

**9th grade algebra**

i think thtz an incomplete question

**9th grade**

= means that 1 is equal to 1 (suppose that there is X and its given that X=5 , so the value of X is equal to 5)

**math& english**

i ll help yew

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