Answer:
answer is -3 just subtract 4 from each side
Step-by-step explanation:
The original price is $450.
<u>Step-by-step explanation:</u>
Step 1:
Given details, Discount%, D% = 30 and Selling Price, SP = $315
Step 2:
Write down formula for calculating the Original Price
Selling Price (SP) = Original Price (OP) - Discount (D)
Discount (D) = Original Price (OP) * (D%/100)
Step 3:
Substitute given values in the formula
315 = OP - D
D = 
D = 0.3 OP
Step 4:
Substitute value of D in the first formula
315 = OP - 0.3 OP
315 = OP (1 - 0.3) = 0.7 OP
Original Price, OP = 315/0.7 = $450
Answer: d=42
Step-by-step explanation:
Both angles are in a supplementary (straight with 180 degrees) line bisected by an angle, so use the supplementary angle theory
(d+7)+(3d+5)=180
4d+12=180
4d=168
d=42