Solve the equation . What is ?
Answer and explanation
Correct answer: D. -7
- Step 1: Move the constant to the right: . Divide by 7: . Answer: -7. Why not the others: -49: forgets to divide by the coefficient. -45/7: moves the constant with the wrong sign. 7: loses the sign.
Practise more Arithmetic, algebra, geometry and statistics.
Free questions with an explanation for every one, and full timed Egzamin Osmoklasisty (Eighth-Grade Exam, Poland) mock tests.
More Arithmetic, algebra, geometry and statistics questions
- Solve . What is ?
- What is 10% of 240?
- A jacket costs 400 zloty. During a sale the price is reduced by 10%. What is the new price?
- A bus travels at an average speed of 45 km/h for 3 hours. How far does it travel?
- A train covers 240 km at a constant speed of 60 km/h. How long does the journey take?
- A rectangle has sides of 15 cm and 3 cm. What is its area?