1. A wooden box measures 8 dm long, 6 dm wide, and 4 dm high. What is the surface area of the box?


2. A house has a roof in the form of a square pyramid with base of 8m and slant height
of 3.5m. How many square meters are there on the surface of the roof?

3. A tin can used for cooking
oil measures 14 cm high and 10 cm in diameter. How
many square centimetres of tin will be required for 2 dozen cans?

with solution please :)​

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

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?

Which of the following expressions cannot be simplified to x – 2?