Please i need help the graph of a sinusoids function intersects it’s midline at (0,-6) and then has a minimum point at (2.5,-9)

Write the formula of the function

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?

What is solution for the following system of equations, 2x+8y=4 and x=-3y+5 1) x=14 y=-3 2) x=2 y=-3 3) x=-3 y=-3 4)x=12 y=5