Jessica bought a new computer for $800. she put $120 down and got a student discount of $50. her mother gave her 1/2 of the balance for her birthday. use the numerical expression to find the amount that jessica still owes for the computer. {800 - (120 + 50)} divided by 2

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Find the measure of angle b in the following triangle

Given: abcd is a square. prove: ac ? bd. we are given that abcd is a square. if we consider triangle aeb and triangle aed, we see that side is congruent to side ad because sides of a square are congruent. we know that side ae is congruent to side ae by using the . finally, we know that side de is congruent to side because the diagonals of a square bisect each other. therefore, triangle aeb is congruent to triangle aed by congruency. we see that angle aed and angle aeb are a linear pair, and congruent by cpctc. thus, the measure of these angles will be 90°, and diagonal ac is perpendicular to diagonal bd by the .