12 questões gratuitas para você testar agora

If 3x + 7 = 2x + 15, what is the value of x² − 4?

A product's price increased by 20% and was then discounted by 20% off the new price. The final price is what percent of the original price?

In a class, the ratio of male to female students is 3:5. If there are 40 students, how many more female students are there than male students?

A machine produces 120 parts in 4 hours. Working at the same rate, how many parts does it produce in 6 hours and 30 minutes?

After the company began offering free coffee, average productivity rose 8%. The director concluded that the free coffee caused the gain. Which of the following most weakens the conclusion?

The city plans to reduce accidents by installing speed cameras on its main avenues. The plan assumes that:

Passage: “Although solar adoption has grown rapidly, the bottleneck is no longer the cost of panels but storage capacity and grid infrastructure.” The main idea is:

What is the value of x? (1) x is an even integer between 3 and 7. (2) x² = 25.

Plan A costs $30 fixed plus $2 per unit; Plan B costs $10 fixed plus $4 per unit. From how many units on is Plan A cheaper than Plan B?

A store sold 200 items in January and 260 in February. The percent growth was approximately:

The average of 5 numbers is 14. If a sixth number equal to 20 is added, what is the new average?

Tab 1: shipping is free only above $250. Tab 2: the customer's order totals $240 and they added an item worth $15. The statement “the order qualifies for free shipping” is: