What is the answer to 4y-18=20

Do i divide or multiply? this is pretty confusing to me ... : / Peter bought 15.5 yards of cord. He paid $0.40 per yard. How much did Peter spend on cord? A. $0.62 B. $6.20 C. $38.75 D. $62.00

Two congruent right triangles with sides of 3, 4, 5 are placed together so that one pair of corresponding sides touch and the resulting figure is another triangle. What would be the perimeter of the resulting triangle?

If you're currently making $8.75 per hour and you're offered a new job that pays $9.47 per hour, how much more would you make per hour at the new job? A. $.72 B. $.28 C. $1.72 D. $1.28

Drum Sticks A drummer is stocking up on drum sticks and brushes. The wood sticks that he buys are $10.50 a pair and the brushes are $24 a pair. He ends up spending $90 on sticks and brushes and buys two times as many pairs of sticks as brushes.

F (x) = x2 + 4 g (x) = x-5 (fog) (x) = ?

Simplify the expression 5y + 7x + 2y - 3x + 9

John makes 2,678 selling pencils, Sandy makes 2,786and Josh makes 3,871, Who makes the most? Who makes the least?

Sang swam 2,000 meters. Lu ran 3 times farther. How far did Lu run?

The rate of depreciation dv / dt of a machine is inversely proportional to the square of t + 1, where v is the value of the machine t years after it was purchased.

What would happen if two quantities in a ratio had different units? How would you simplify it?