Answer:
Step-by-step explanation:
proportion time...
3 teaspoons salt to 4 cups flour = x teaspoons salt to 28 cups flour
3 x
----- = ----- cross multiply
4 28
(4)(x) = (3)(28)
4x = 84
x = 84/4
x = 21 <==== 21 teaspoons of salt are needed
Answer: 34/24
Step-by-step explanation:
Answer:
Step-by-step explanation:
A
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.