I need help with 6 and 7 with an explanation

6. A dear friend has forgotten the formula for the area of a trapezoid of height b with bases of lengths a and b. b b a Choose any two of the following strategies and help your friend derive the formula. Write complete sentences supported by pictures to support your strategy. 1. Trapezoid as two triangles 2. Trapezoid as a parallelogram with half the height bold Tome,901 3. Trapezoid as half of a parallelogram with the same heights 7. For each of the following, draw the first three terms of a visual pattern that has the given number of blocks in the neh figure. There needs to be a coherent visual pattern; that is, someone should be able to draw the fourth term by looking only at what you drew. a. n2 - (n - 1)2 b. n2 + 2n c. 2 + 4 + 6+ ... + 2n d. n3