Which of the following relations is a function?

A.

(2, 1), (-2, 4), (-5, 1), (2, - 5)

B.

(-5, 4), (-2, 6), (-5, 3), (7, 2)

C.

(-5, 1), (-2, - 5), (2, 5), (7, 1)

D.

(-5, 1), (-2, 4), (2, - 5), (-2, 6)

Fiona, Peter and Angad share some sweets in the ratio 4:5:1. Fiona gets 40 sweets. How many sweets are there altogether?

1kg of apples costs £2.40. How much do 2 1/2kg of apples cost?

What is the volume? 3 yd 10 yd 5 yd

Bob deposits $5000 into an account that pays simple interest at a rate of 4% per year. How much interest will he be paid in the first 6 years?

A turtle is at the bottom of a 20 foot well. Each day it crawls up 4 feet but it slips back 2 feet. After how many days will the turtle reach the top of the well?

On a map 1 inch equals 18.4 miles. If two cities are 4.5 inches apart on the map, how far are they actually apart?

What is 66 tens-30 tens

A measuring cup holds 250 mL. How many times must the measuring cup be filled to measure 1 L of water?

What is y in the equation 14-6y=44

The period T (in seconds) of a pendulum is given by T=2/pi / sqrt ((L) / (32)), where L stands for the length (in feet) of the pendulum. If / pi = 3.14, and the period is 1.57 seconds, what is the length?