The changs updated their bedroom by purchasing a new lamp for $89.95 and a comforter set for $239.99. they paid 6 3/5 % sales tax on their purchases. if the changs paid $351.72 total, determine if they paid the correct amount.
a. the changs family paid $0.33 too much for their purchases.
b. the changs family paid $0.99 too much for their purchases.
c. the changs family paid $5.94 too much for their purchases.
d. the changs family paid the correct amount for their purchases

  d.  The Changs family paid the correct amount for their purchases

Step-by-step explanation:

The total of the prices of the goods is ...

  $89.95 +239.99 = $329.94

Sales tax adds 6.6%, so multiplies the price by 1.066. The resulting total with tax is ...

  $329.94 × 1.066 = $351.72

This is the amount paid, so the family paid the correct amount.

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

i'm sorry i don't know

step-by-step explanation: