Question

In a cave, a stalactite gets 4 millimeters longer each year. This year it is 72 centimeters long. How many years until it is 1 meter long?

Answer 1

Given :   in a cave, a stalactite gets 4 millimeters longer each year.

This year it is 72 centimeters long.

To Find :  How many years until it is 1 meter long

Solution:

1 m = 100 cm

1 cm = 100 m

Current length  = 72 cm

Length after x years = 1 m = 100 cm

Length increased in x years  = 100 -72 = 28 cm

1 cm = 10 mm

=> Length increased in x years  = 28 * 10  = 280 mm

Length increase in 1 year = 4 mm

=> Length increase in x year = 4x mm

Equate both

=> 4x  = 280

=> x = 70

its 70 years  until it is 1 meter long

Learn More:

Solve the inequalities and represent the solution graphically on ...

brainly.in/question/17175136

Solve the following system of inequalities graphically: 3x + 2y ≤ 150 ...

brainly.in/question/17175146