Let W be the union of the second and fourth quadrants in the​ xy-plane. That​ is, let W= x y : xy≤0. Complete parts a and b below. a. If u is in W and c is any​ scalar, is cu in​ W? Why? A. If u= x y is in​ W, then the vector cu=c x y = cx cy is in W because (cx)(cy)=c2(xy)≤0 since xy≤0. B. If u= x y is in​ W, then the vector cu=c x y = cx cy is not in W because cxy≥0 in some cases. C. If u= x y is in​ W, then the vector cu=c x y = cx cy is in W because cxy≤0 since xy≤0.

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places

-8/2y-8=5/y+4-7y+8/y^2-16

we move all terms to the left:

-8/2y-8-(5/y+4-7y+8/y^2-16)=0

we can not solve this equation

2 x 503

step-by-step explanation:

its 1006

i would love   to but there is no graph shown

step-by-step explanation:

i am so sorry