Physics
Dude, Edx is for you to solve on own. Not copy-pasting in forums for others to solve for you.
Calculus
Verify the identity. (Left side to right side) {(sinu+sinv)/(cosu+cosv)}=tan1/2(u+v)
physics
A 250-kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
math
two equations two unknowns: 3r - 2s = 0 2r + 3s = 13 3r - 2s = 0 =>r=2s/3 Substituting in (eqn 2)=> 2*2s/3 +3s = 13 solve for s =>s((4/3)+3)=13=>s(13/3)=13=>s=3=>using eqn 1 r=2
math
use order of operations First solve in parentheses then exponents then multiplication and division then addition and subtraction. 5(-39-(-74-85))=5(-39+(159))=5(120)= 600
Math
you have to divide both sides by a negative 0.4 doing this changes the < to > by rule. x>-12/-.4 = x>30
math
f(x)=-9x-10 if you read your text it states that slope intercept form is y=mx+b where m is the slope here -9 and b is the y (or f(x) )intercept -10. to find the solution to the system look at the solution I gave for your other problem and use the same technique
Math
solve both of the equations for y if the slopes are recipricals of one another the lines are perpendicular otherwise if they are the same slope they are parallel
Psy285
Altruism is the selfless concern for the welfare of others. In order to answer this question you have to think why people help others (which is more philosophical).
math
(13/25)*100%= 52%
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