Answer:
£223 was the original price
Step-by-step explanation:
35% of original price = £78
1% of original price = £78/35 = £2.23
100% of original price = 2.23 x 100 = £223
Aerobics=20 yoga= 50
20 + 30 = 50 (30 more) and then 20 + 50 = 70 aka 1 hour 10 mins
Answer:
Given 7b²-21b-273=7, the solutions are x1 = 8 and x2 = -5.
Step-by-step explanation:
Given 7b²-21b-273=7, first you need to equal zero. So
7b²-21b-273-7=0 ⇒ 7b²-21b-280 = 0
The secon step is to find the solutions applying Bhaskara´s formula x = (-b ± √(b²-4×a×c))/2×a
Where a=7, b= -21 and c= -280
After you identified each term, you have to replace it on the formula so....
x = (21 ± √(21² - 4×7×(-280)))/2×7 ⇒ x = (21 ± √(441 + 7840))/14 ⇒ x = (21 ± √8281)/14
Then you will obtain two values for x, called x1 = 8 and x2=-5.
If large eggs are 60 grams, and you have 12, multiply 60 by 12 and you get the final answer. So 12 large eggs has a mass of 720 grams. Hope that helps!