Question

Could someone please answer and explain step by step?

Answer 1

`\\ \sf\longmapsto 4\left((7)/(8)\right)+7\left((3)/(4)+(1)/(8)\right)-10`

`\\ \sf\longmapsto (4(7))/(8)+7\left((6+1)/(8)\right)-10`

`\\ \sf\longmapsto (28)/(8)+7* (7)/(8)-10`

`\\ \sf\longmapsto (28)/(8)+(49)/(8)-10`

`\\ \sf\longmapsto (28+49-80)/(8)`

`\\ \sf\longmapsto (78-80)/(8)`

`\\ \sf\longmapsto (-2)/(80)`

`\\ \sf\longmapsto (-1)/(40)`