Write 4.9 × 10–8 in decimal notation

0.000000049.

Step-by-step explanation:

This will have  7 zeros after the decimal point followed by 49:

4.9 × 10^–8 = 0.000000049.

If we imagine the decimal point making jumps to the right over the digits it takes 8 jumps till it gets to 4.9. that's where the -8 comes in.

6/20

step-by-step explanation:

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25