Which expression is equivalent to 10 square root 5 awnsers

a.) square root 500
b.) square root 105
c.) square root 50
d.) square root 15

X+ y = 5 ; x - y =3 solve using linear combination

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Igure 1 and figure 2 are two congruent parallelograms drawn on a coordinate grid as shown below: 4 quadrant coordinate grid showing two parallelograms. figure 1 has vertices at negative 5, 2 and negative 3, 4 and negative 4, 7 and negative 6, 5. figure 2 has vertices at 5, negative 2 and 7, negative 4 and 6, negative 7 and 4, negative 5. which two transformations can map figure 1 onto figure 2? reflection across the y-axis, followed by reflection across x-axis reflection across the x-axis, followed by reflection across y-axis reflection across the x-axis, followed by translation 10 units right reflection across the y-axis, followed by translation 5 units down