Answer: 30
Step-by-step explanation:
3+4+3=10 400/10=40 so each has 40 so math has 120 120*25=3000 for physics is 4*40 so 160 160*20=3200 9800-3000-3200=3600 3*40=120 3600/120=30
<em><u>Correct steps are shown</u></em>
<em><u>Correct simplified expression is:</u></em>

<em><u>Solution:</u></em>
<em><u>Given that: Mara simplifies the expression</u></em>

<em><u>Correct steps are:</u></em>
From given,

<em><u>Use the distributive property,</u></em>
a(b + c) = ab + bc
Therefore,

Group the like terms

Thus the expression is simplified
After 3D and before E is X