Add or subtract. write each sum or difference in simplest form. homework
1. 2/3 + 6 1/5=?
2. 5/12 - 3/20=?
3. 1 3/10 + 1/4=?
4. 3 1/6 - 1/7=?

1. 6 13/15

2. 14/60 or 7/30

3. 1 11/20

4. 3 1/42

Step-by-step explanation:

take the LCM of the denominators (like 2/3 and 6 1/5 would be 15) and multiply both the numerator and denominator by whatever number makes the denominator the LCM. (so 2*5/ 3*5 would get 10/15 and 1*3 and 5*3 would get 3/15, add to get 6 13/15 the 6 is the whole number that 1/5 came attached to which can get bigger or smaller if you had for example 16/15 would be 7 1/15)

dilation scale factor 2: starting with δabc, draw the dilation image of the triangle with a center at the origin and a scale factor of two. notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). dilation with scale factor 2, multiply by 2.

the answer to your question is c.)   volcanoes built the mountains and earthquakes tore them down.

step-by-step explanation: