10 party favors

y=number of girls      2.25 y = total cost of girls party favors

x= number of boys is also equal to (10-y)    1.75 (10-y) = total cost of boys' party favors

Total cost of Boys' and Girls' party favors = 20.50

2.25y + 1.75(10-y)  = 20.50

2.25y + 17.50 -1.75y = 20.50

 .5y +17.50 = 20.50

.5y = 3.00

y = 6 = girls         boys = 10 - y = 10-6 = 4 boys

e^-3  = 2.718282^(-3) = .049787

If the numbers are all positive, result is positive

If ONE is negative, result is negative

If TWO are negative, result is positive

If all THREE are negative, result is negative

In a right triangle, sin of an angle = opposite/ hypotenuse

sin(angle)= 19/30 =.63333

the ANGLE will be   Arcsin(.63333) = 39.296 degrees

yep, just add real parts together....   and i parts together...

cos(300) = 0.5     cos(60) = 0.5

2.4   =   2  4/10   =  2  1/5  =  11/5

Sorry HSC......If you look at the definition of 'defy'    you will see that birds DO defy gravity:

de·fy

dəˈfī/

verb

openly resist or refuse to obey.

"a woman who defies convention"

synonyms:disobey, go against, flout, fly in the face of, disregard, ignore;

LOL