I think your answer is better BUT:
I am not sure where you arrived at a dimensionless 2,000,000!
When questions are unclear.....so are the resuts, huh?
x+y = -.5
2x-y = -13.3 Add the two equations
3x = - 13.8
x = 4.6 Now use this value of 'x' in one of the equations to calculate 'y'
Question is unclear, but Here is a solution using law of sines: (there is a better answer below from arism)
cos^2 + sin^2 = 1
1/16 + sin^2 = 1
sin^2 = 15/16 sin = sqrt15 /4
tan = sin / cos = sqrt15/4 /1/4 = sqrt 15
2x^2 + 10x + 2y^2-6y = 18 divide by 2
x^2 + 5x + y^2 -3y = 9 complete the squares
(x+2.5)^2 + (y-1.5)^2 = 9 + 6.25 + 2.25
= 17.5 = r^2 area = pi r^2 = 17.5 pi
(3 - 3i)(-5 - 4) =
(3-3i)(-9)=
-27+27i
7:30 + 2 hr + 1/3 hr + 2 hr + 3/4 hr +3 hr = 15 :35 3:35 pm
Agree ....except final units will be cm
Distance is the same regardless of the speed for this question
rate x time = distance
40 m/h * x = distance
30 m/h * (x + 1/3) = distance 1/3 = 1/3 hour = 20 minutes
40x = 30 (x+1/3)
40x = 30x + 10
10x = 10
x = 1 hr
40 m/hr x 1 hr = 40 miles check 30 m/h x 1 1/3 = 40 miles Check!
212 - 14 - 58 - lettuce = 34 solve for lettuce
But I think some of those numbers in your question might be fractions?
