PQRS is a rectangle whose diagonals intersect at O. What
is the size of the obtuse angle
between the diagonals?
62
S
R
A.) 124
B.) 118°
C.) 112°
D.) 90°

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.