4 Which of the following expressions are equivalent to
colo
4 9
+
7
7
Choose 2 answers:
4
8
+
9
9
+
8
7
9
© --+4+
8 9
+
9
8
8
4.
+
7
4
+
7
9
8
9
0

Write two subtraction equations that are equivalent to 5 + 12 = 17.

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

It says factor each expression 49x-28?