About 260 because 202 plus 57 equals 259 and that'll round to 260
She worked as a carpenter for 12 hours and as a blacksmith for 18 hours.
Assuming you mean she earned $20 as a carpenter and $25 as a blacksmith per hour, with a total of 30 hours for $690,
let c represent carpenter hours and b for blacksmith hours.
20c + 25b = 690
c + b = 30
Subtract b from each side so that c = 30 - b
Plug this value into the first equation
20(30 - b) + 25b = 690
600 - 20b + 25b = 690
600 + 5b = 690
5b = 90
b = 18
To find c, plug this value of b into the other equation
c + 18 = 30
c = 12
3,10,5 CANNOT be a triangle as 3+5 IS NOT greater than or equal to 10
10,8,5 CAN be a triangle as 8+5 is greater than or equal to 10
a simple way to figure out if three lengths can be a triangle is to take the two smaller numbers and see if they are greater than or equal to the larger number.
Eight plus the quotient of a number and 3 is −2
8 + (x/3) = - 2
Hope it helps
The one on the left is -5/6
The one on the right is 1/21