So, I have 3 questions I need help with that I don't really understand 1. In an alloy, copper and zinc are mixed in the ratio 5:3 by weight. If the weight of a block of the alloy is 4.8kg, find the weight of copper in it.

2. The numbers of clerical and technical staff in a company are in the ratio 2:5. If the total number of staff in the company is 28, how many of them are technical staff?

3. In a solution, water and alcohol are mixed in the ratio 4:1 by volume. Find the amount of alcohol in 750 cubic centimeters of the solution.

Will give brainliest for the correct answer, thanks for the help!

Cynthia takes her dog to the park every 2 days. she bathes her dog every 7 days. if she took her dog to the park and bathed him today, how long will it be until she does both on the same day again?

Aadc is formed by reflecting aabc across line segment ac, as shown in the figure. if the length of ac is 4 units, the area of aadc is square units.

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?