Asap i've been stuck with this for days
use sum and difference identities to verify which of the following are identities.
1) sin(x+ 2pi/4) =√2 sinxcosx
2) cos( x- pi/3) = 3/√2 (cost-sinx)
3) 14( sin^2x - cos^2x - tan^2x) = 14tanxsinx
4) 15( 1-cos^2x / cos^2x) = 15cot^2x
5) 11( csc^2x - sec^2x - cot^2 x)= 11tanxsecx
6) 9( 1-sec^2x/ sec^2x) = 9cot^2x

The blue whale is the largest animal living on the earth. the average blue whale measures 100 feet long (30 meters) and weighs 300,000 pounds (136,000 kilograms). a whale’s head is 1⁄3 of the length of its body. a new baby whale is 1⁄4 the length of a grown whale. the average man is 1⁄17 the length of a blue whale, and 1⁄1,818 its weight. a human baby measures 1⁄4 of the length of an adult. calculate the following information: how long is a whale’s head? how long is a new baby whale? how tall is the average man? how much does the average man weigh? how tall is the average human baby?

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

Given that abcd is a rhombus, what is the value of x?