Find the reciprocal of 2/5.
Use the / as the fraction bar.​

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20