Astraight line on a speed-time graph means the speed
is constant. this means the speed is not changing over time.
how is this different from a distance from a distance-time graph?

Explanation:

I know its really hard to get the difference but you just have to memorize it

Distance and time graph include

constant speed (going horizontally up)

stationary (not moving) (vertical)

acceleration (a curve going like a half smiley face)

returning to the origin (going up then going back down)

speed and velocity graph includes

acceleration (going horizontally upwards)

constant speed ( going horizontally consistently)

deceleration (horizontally downward in other words starts from the upper hand y axis and falls)

stationary(at zero diagonally)

idk i’m struggling too

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3