What is x if 3x+9=12?

The following show a change of scale made by an architect in one of his drawings. Old: 1 in. = 16 cm. New:1in. = 2cm Which is the change in scale factor from the old scale to the new scale?

Sausages come in packets of 7. Bread rolls come in packets of 5. Dan wants to buy enough packs of sausages and rolls so that there are an equal number of sausages and rolls. What is the minimum number of sausages and rolls he needs to buy?

Dianne spends 40% of her net income on rent and 15% of her net income on food. If she spends a total of $1375 per month on rent and food, what is her net monthly income?

Jerry played with 3 friends today, all at different times. He played with Tommy for 7/8 7 start fraction, 7, divided by, 8, end fraction of an hour, then Nathan for 3/4, then Chris for 3/2 How many hours did Jerry play with his 3 friends today?

If 18 meters of high resistance wire with a diameter of 1.2 mm has a resistance of 10 ohms, what is the resistance of 27 m of the same type of wire with a diameter of 1.5mm?

A baseball player hit 65 home runs in a season. Of the 65 home runs, 19 went to right field, 23 went to right-center field, 9 went to center field, 11 went to left-center field, and 3 went to left field.

How many milliliters of olive oil (D=0.92 g/mL) have the same mass as 1.80 L of gasoline (D=.74 g/mL)

Leo's family keeps recyclables in a cylindrical trash can. Today Leo bought a larger can with a radius and height that are twice the radius and height of the old can. Leo claims the new and old cans are geometrically similar figures.

The value of Maggie's car decreased by 30% since last year, when she bought it. If the car is now worth $17,000.00, how much was the car worth when she bought it?

The base of a rectangle has a length of 4 inches and a diagonal has a length of 5 inches, Find the area of the rectangle