Okay well for starters, you can't subtract that because it's an expression, not an equation. And secondly, there was '?' which I'm going to assue=me was a typing error.

Now to actually simplify this mess of an expression, you just need to combine the like-terms! Once you do that you really can't do anything else, since you don't know the varibles.

5 0

3 years ago

Where does the pythagorean identity sin^2 + cos^2=1 come from? How does it relate to right triangles?

Arada [10]

Consider a right triangle with hypotenuse of 1.
sin x means to divide the side in front of the angle by hypotenuse
cos x means to divide the side beside the angle by hypotenuse
we know that a^2+b^2=c^2 now divide two sides by c^2
$\frac{ a^{2} }{ c^{2} }+ \frac{ b^{2} }{ c^{2} }=1$
c is 1 also a/c means sinx and b/c is cos x so
sin^2(x)+cos^2(x)=1

8 0

4 years ago

Help me out i would appreciate it

Mariulka [41]

Step-by-step explanation:

find the area of the rectangle

then surface area=.......

then subtract by the volume of rectangle by the other one

7 0

3 years ago

3.4-2.8d+2.8d-1.3. Combine like terms to simplify the expression

tekilochka [14]

3.4 - 2.8d + 2.8d - 1.3 = 3.4 - 1.3 - 2.8d + 2.8d = 3.4 - 1.3 = 2,1

8 0

3 years ago