the perimeter of a rectangle is 50 cm and the length is 4 cm longer than the width. write and solve the system of equations using the substitution method.
a. width = 10 cm, length= 14 cm
b. width = 10 1/2 cm, length= 14 1/2 cm
c. width = 11 cm, length= 15 cm
d. width = 23 cm, length= 27 cm

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.