Answer:
(r*s) = (x-5)(2x+6) = 2x2 + 6x - 10x - 30 = 2x2 - 4x - 30
(r-s)(x) = x-5 - (2x+6) = x - 5 - 2x - 6 = -x - 11
(r+s)(x) = x - 5 + 2x + 6 = 3x + 1
(r + s)(3) = 3(3) + 1 = 9 + 1 = 10
Step-by-step explanation:
Answer:
-3
Step-by-step explanation:
The equation to find this is:

So, plugging the numbers in:

Answer:
option 4
Step-by-step explanation:
using the sine/ cosine ratios in the right triangle and the exact values
cos30° =
, sin30° =
, then
cos30° =
=
=
( cross- multiply )
2x = 20
×
= 20 × 3 = 60 ( divide both sides by 2 )
x = 30
and
sin30° =
=
=
( cross- multiply )
2y = 20
( divide both sides by 2 )
y = 10
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