If a
1
=
7
a
1
​
=7 and
a
n
=
3
a
n
−
1
+
4
a
n
​
=3a
n−1
​
+4 then find the value of
a
4
a
4
​
.

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Aflower has 26 chromosomes. to create a new flower, how many would a sperm cell have what is called?