Asubmarine's position is 600 feet below sea level. it descends 218 feet. what is the submarine's new elevation?
a) -818 ft
b) -600 ft
c) -382 ft
d) 382 ft

pl hl

Answer with explanation:

If Submarine position is 600 feet below sea level, it can be represented in terms of integers as = - 600

Now , it descends 218 feet ,from where it is presently Located.

Descend in terms of integers can be represented as = - 218 feet

Submarine New position or Elevation = - 600 feet + (-218 feet)

                                            = -818 feet

Option A : -818 feet

A) -818 feet

Step-by-step explanation:

Given : A submarine's position is 600 feet below sea level. It descends 218 feet.

Integers , we use negative (-) signs to represent below and descend .

Thus , in terms of integers

Initial position of submarine 600 feet below sea level= -600 feet

After descends 218 feet, the submarine's new elevation =

-600+(-218) feet

= -600-218 feet     [(+)(-)=(-)]

= -(600+218) feet = -818 feet    [-a-b=-(a+b)]

Hence, the submarine's new elevation = -818 feet

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x