The work of a student to solve a set of equations is shown below:
equation 1: x + 2y = 10
equation 2: 2x + 5y = 15
step 1: –2(x + 2y) = –2(10)
2x + 5y = 15
step 2: –2x – 4y = –10
2x + 5y = 15
step 3: 1y = 5
step 4: x + 2(1) = 10
step 5: x = 8
in which step did the student first make an error? (4 points)
step 1
step 2
step 3
step 4

Use a transformation to solve the equation. w/4 = 8 can you also leave a detailed explanation on how this equation = 32

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?

What is 617.3 miles and each gallon of gas the car can travel 41 miles select a reasonable estimate of the number of gallons of gas karl used.