What is the size of angle BAC?

76°

Step-by-step explanation:

ABC is an Isosceles triangle and angle ABC is given as 52°

since xy is parallel to BC we can conclude that ACB is also 52°

The sum of interior angles in a triangle is equal to 180°

52° + 52° + BAC = 180°

104° + BAC = 180°

BAC = 76°

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

answer: x=60