Andrew measured the masses of different rock samples. He found that the mass of the
sample was 1.64 kilograms and the mass of the quartz sample was 0.83 kilogram.
Andrew wants to know the total mass of the two rock samples. Shade the grids below to
the sum of the masses of the granite and quartz samples.

the answer is 2.47 but i cant shade in the graph for you im sorry. but have a good day buddy

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.