PLEASE HEL

1. Which of the following figures can also be classified as a parallelogram?

Select all that apply.

square

trapezoid

rhombus

right triangle

rectangle

pentagon

2. Classify the triangle by its sides.
A triangle has three side lengths of 10 centimeters.

right triangle
scalene triangle
equilateral triangle
acute triangle

3. The ratio of the angle measures of a triangle are 1:2:2. What type of triangle is this?

acute triangle
right triangle
obtuse triangle
equiangular triangle

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?