An empty container has a mass of 0.6 kg.
When the container is full of rice, it has a mass of 18.6 kg.
The average mass of a grain of rice is 2 x 10-2 g.
Use this information to work out how many grains of rice are in the container.
Give your answer in standard index form.

There are 9 × 10^5 grains of rice in the container.

Step-by-step explanation:

Mass of empty container = 0.6 kg

Mass of container filled with rice = 18.6 kg

⇒ Mass of rice = 18.6 - 0.6 = 18 kg

Mass of one grain of rice = 2 × 10^-2 g = 2 × 10^-2/10³ kg (∵ 1 kg = 1000 g)

                                          = 2 × 10^-5 kg

⇒ Number of grains of rice = Total Mass of rice/Mass of 1 grain

                                             = 18/2 × 10^-5

                                             = 9 × 10^5 grains of rice

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq