Urgent

find the exact value by using a half-angle identity.

cosine of negative pi divided by eight

one half times the square root of quantity two minus square root of two
one half times the square root of quantity one minus square root of two
one half times the square root of quantity two plus square root of two
one half times the square root of quantity one plus square root of two

y -5 = (-1/4)(x + 8)

step-by-step explanation:

a, b, c, d are correct.

step-by-step explanation:

we have g(x) = 3 and are required to find which option is a translation of g(x).

now, 'translation' is a transformation which means to shift the function in any direction and the general form of translation is g(x) + k, where k is any real number.

so, according to the options we see that all are correct as they satisfy the general form of translation.

also, it can be seen from the graph below that the function g(x) = 3 is shifted from its position in all the four options.

can someone me: the midsegment through the legs of an isosceles triangle is 4 in. find the sides of the triangle if its perimeter is 20 in. ,   and point g is the centroid of the right △abc with hypotenuse ab=18 in. find cg.