हिंदी में जवाब दो: A submarine is at a depth of 120 m below sea level. It rises by 45 m and then descends by 30 m. At what depth is it now?
Get the complete, step-by-step math solution for: "हिंदी में जवाब दो: A submarine is at a depth of 120 m below sea level. It rises by 45 m and then descends by 30 m. At what depth is it now?". Powered by SolveForX AI math tutor.
Step-by-Step Solution
Step 1: Representing initial depth
We represent the depth below sea level as a negative value. So, an initial depth of 120 meters below sea level is written as -120 meters.
Step 2: Calculating depth after rising
When the submarine rises, its depth decreases. So, we add the distance it rises (45 m) to its initial depth.
Step 3: Calculating depth after descending
After rising, the submarine descends. Descending means its depth increases further below sea level, so we subtract the distance it descends (30 m) from its current depth.
Step 4: Simplifying the expression
First, we calculate the depth after rising: −120+45=−75 meters. Then, we subtract the descending distance: −75−30=−105 meters. The negative sign indicates that the submarine is 105 meters below sea level.