A) find, in ascending powers of X, the first 4 terms of the expansion (1+X)^7. B) Hence, find the coefficient of y^3 in the expansion of (1+y-y^2)^7.

Please help, this is mindbending. I understand (A) but not (B)​

Write the sentence as an equation. 6 fewer than the quantity 140 times j equals 104

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8