For a quadrilateral to be a rhombus, the diagonals and . first blank choices:
must be congruent
must not be congruent
can be congruent or not congruent

second blank choices:
must be perpendicular
must not be perpendicular
can be perpendicular or not perpendicular

Ineed or else im in trouble need a random sample of 240 park users were asked if they go to the park more often on weekdays or on the weekend. the results are shown in the table. weekdays weekend male (50) (10) female (150) (30) based on the data in the table, select correct or incorrect for each statement. correct or incorrect 1.the males go to the park more often on the weekend. 2.the females go to the park more often on weekdays. 3.for the participants in the survey, gender affects which days of the week a person goes to the park.

In δabc, if the length of side b is 3 centimeters and the measures of ∠b and ∠c are 45° and 60°, respectively, what is the length of side c to two decimal places?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?