ABCD is a parallelogram. Find the values of x and y. Solve for the value of z, if z=x−y.

C. z = -10

Step-by-step explanation:

Same side interior angles of parallel lines cut by a transversal are supplementary.

x + 30 + x - 30 = 180

2x = 180

x = 90

x - 30 + y + 20 = 180

90 - 30 + y + 20 = 180

y + 80 = 180

y = 100

z = x - y = 90 - 100

z = -10

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt