Answer:
35
Step-by-step explanation:
if you divide 21 by 3, which is 7, then multiply that number by 5, it gives you thirty five then you can go back and check your work, 35/5 times 3
The values of a and b in the given surd expression are; a = 27/22 and b = 1/2
<h3>How to simplify surds?</h3>
The correct expression is;
(7 + √5)/(7 - √5) - (7 - √5)/(7 + √5) = a + (7/11)√5b
Let us first rationalize the denominator of the first term to get;
(7 + √5)/(7 - √5) = [(7 +√5)/(7-√5)] * [(7 + √5)/(7 + √5)]
⇒ (54 + 14√5)/44
⇒ (27/22) + 7(√5)/22
Let us first rationalize the denominator of the second term to get;
[(7 - √5)/(7 + √5)] * [(7 - √5)/(7 - √5)]
⇒ (54 - 14√5)/44
⇒ (27/22) - 7(√5)/22
Thus;
a = 27/22 and b = 1/2
Read more about surds at; brainly.com/question/24700530
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Answer:
B. $3.20
Step-by-step explanation:
Do 256 / 80 visits per year to get 3.20
Answer:y=2/3x
Step-by-step explanation:
y=2x-2y
combine like terms
y+2y=2x
y=1
so 1y+2y=3y
3y=2x
divide 3 on both sides 3y =2x