151 Total surface area of hemisphere (given radius) 152 Volume of barrel (cask) (given radii and height) 153 Middle radius of Barrel (given volume,top radius and height) 154 Top or bottom radius of barrel (given volume,middle radius and height) 155 Height of Barrel (given volume,middle radius and top radius) 156 Euclidean distance between two points of the plane with Cartesian coordinates 157 Euclidean distance between two points in three-dimensional (3D) space with Cartesian coordinates 158 Length of hypotenuse of right triangle with Pythagorean theorem 159 Length of side b of right triangle in Pythagorean theorem 160 Length of side a of right triangle in Pythagorean theorem 161 Non-negative square root of a non-negative real number 162 Square of a real number 163 Percentage of a number (amount) in a given total 164 Calculate a number (amount) (given percentage and total) 165 Calculate the total given a percentage of the total 166 Power or exponentiation (given base and exponent) 167 n-th term of a geometric sequence or geometric progression with initial value and common ratio 168 Time needed for two workers to do a job together (group work) (given individual capacities) 169 n-th square pyramidal number or pyramid number 170 n-th term of arithmetic progression (AP) or arithmetic sequence (given common difference) 171 Initial term of arithmetic progression or arithmetic sequence (given n-th term and common difference) 172 Common difference of arithmetic progression or arithmetic sequence (given first and n-th terms) 173 Arithmetic series (given initial term,n-th term,arithmetic progression,arithmetic sequence) 174 Arithmetic series (given initial term,common difference,arithmetic progression,arithmetic sequence) 175 Initial term of arithmetic progression or arithmetic sequence (given n-th term,arithmetic series) 