A chemical company makes two brands of antifreeze the first brand is 55% pure anti-freeze in the second brain is 80% pure anti-freeze in order to obtain 50 gallons of a mixture that contains 70% pure anti-freeze how many gallons of each brand of antifreeze must be used

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain

10x − 5y + 14 = 0 whats the answer pls

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?