15 A researcher wants to determine if the behavior of children is alle
video games that have violent content. He asks the parents of 100 children in a
day care center how often each child plays video games and whether the video
games they play have violent content. The children are then allowed to play in
a controlled environment, such as the day care center's playground. Any violent
behaviors are then noted.
What type of study is the researcher conducting?
A. census
B. experiment
C. observational study
D. sample survey

what is the answer?

the answer will be b x² +x-1

step-by-step explanation:

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.