Just took the test and got 100%!! Here ya go!
Answer:
assuming the comma is meant to be a decimal...
It would be 2.9
Step-by-step explanation:
the place right after the decimal is the tenth place. the 5 rounds up the 8. don't worry about the 2. so the 8 becomes a 9 and you leave off the rest because you are only worrying about the tenths place.
Answer:
16
Step-by-step explanation:
=-2(7-15)
USING 'BODMAS' RULE
= -2(-8)
= -2*-8
= 16
Answer:
(7,12),(-12,-7)
Step-by-step explanation:
x^2 + y^2 = 193
x - y = - 5
x = y - 5
(y - 5)^2 + y^2 = 193
y^2 - 10y + 25 + y^2 = 193
2y^2 - 10y + 25 = 193
2y^2 - 10y + 25 - 193 = 0
2y^2 - 10y - 168 = 0
2*(y^2 - 5y - 84) = 0 This factors into
2*( y - 12) (y + 7) = 0
y = 12
in which case x = 12 - 5 = 7
y = - 7
in which case x = -7 - 5 = - 12
