In digging a hole, the construction crew records the depth of the hole relative to the ground level. The starting depth is zero feet. The table shows the proportional relationship between the depth of the hole and the number of hours digging. Find the constant of proportionality. How many hours of digging does it take for the depth of the hole to reach -38.5 feet?

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

What is the circumference of a circle with an area of 50.24 cm²?