One grain of sand = 7*10 to the power of -5 how many grains of sand are in 6300 kg

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

Im literally having a mental breakdown

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?