Step-by-step explanation:
1st digit is 1 number (1)
2nd digit is (3,4,5) so it's 3 numbers
third digit is (6,7,8,9) is it's 4 numbers
last 7 digits is 10 (0,1,2,3,4,5,6,7,8,9)
multiply
1*3*4*10=120
so answer is 120 phone numbers
42 less then a number z....
z - 42 <== ur expression
The midpoint between -4 and 8 is answer B) 2
320 pounds of algea. After 4 hours, it would be 80, After 8 hours, 160. After 12 hours, 320