the local used book store is having a sale. They sell every paper bag for the same price and every hard cover for another. Nate buys two paperbacks into hardcover books for $25. Tia by three paperbacks and one hardcover book for $22.50. write and solve a system of equations to determine the cost of each kind of book. show your work.​​

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

What percent of 18 is 24? and plz explain thx.