(4). Tara has £42.76 in her bank account. she pays in a cheque for £52.60 and writes cheques for £4.26, £3.59, and £27.80. the amount of money left in her account is how much??​

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem

Plz ( true - false) all triangles have interior angles whose measure sum to 90.