Correct Answer: Option C

Explanation

5 \(\times\) x\(^1\)  + 5 \(\times\) x\(^0\) + 5 \(\times\) x\(^1\) + 2 \(\times\) x\(^0\) = 77

(change all  to base 10)
5x + 5 + 5x + 2 = 77
10x + 7 = 77
10x = 77-7
10x = 70
x = 70/10
x = 7

There is an explanation video available below.

• how long will it take for a 1.5A current to coat evenly a layer of copper 0.1mm thick on both... Answer this

  4 Answers   ·   Physics   ·   5 years ago
• Pulse of vein is it readily detectable? Answer this

  2 Answers   ·   Biology   ·   3 hours ago
• Metals that can be reduced from their oxides thermally? Answer this

  2 Answers   ·   Chemistry   ·   3 hours ago