which of the following hypotheses can be tested with experiments? select all that apply

1.) a diet low in sugar reduces the risk for heart disease
2.) coffee increases subject performance on intelligence tests
3.) people that brush their teeth live longer than those who don't brush their teeth
4.) scientists will find a cure for cancer before the year 2020

I know that 4 isn't the answer so I selected the other three and it said I was wrong. isn't a hypotheses something that can be experimented on so can't all of the three have experiments If I'm making sense ​

Name & describe the six essential activities of the digestive tract. Which is NOT a propositionA. Marlon is eating his lunch B. Will you be at school tomorrow.C. The earth is rectangularD. 10 + 5 = 15 if ABC = DEF, which side is congruent to EF?A. ABB. BCC. AC Jessie borrowed $1800 from the bank at a rate of 7.5% simple interest per year. Over the course of 4 years, how much interest did he pay? scenarios that describe a country with a healthy economy Rewrite this paragraph and make it better: My father is a teacher. I admire him a lot. I am considering becoming a teacher too. My older brother works for a big company. My father really loves learning, so he is a natural teacher. My father always helped me with my homework. I guess I will become a teacher. * Re write: "She never seems to succeed even though she works hard." with However WRITE A PARAGRAPH ABOUT INTRESTING FACTS ABOUT IDAHO/FUN FACTS Solve the equation 6x^2 + 15x + 3= 2x^2 to the nearest tenth. somebody please help meeWhich two sources are secondary sources for an essay on World War II? 1) a history textbook on the events of World War ll2) a book about the effects of World War ll 3) The Diary of Anne Frank (the experiences of Jewish family during World War II) 4) the Constitution of France 5) letter written by a soldier who fought the Germans The viscid silk produced by the European garden spider (Araneus diadematus) has a resilience of 0.35. If 10.0 J of work are done on the silk to stretch it out, how many Joules of work are released as thermal energy as it relaxes? Read this excerpt from a letter to the city council:Dear city council members:The city has proposed limiting library hours in order tosave money. I understand that the city budget is beingchallenged at the moment, but no good will come ofdenying children access to the library after school.Children go to the library to learn and to get help with theirhomework. As a single parent, I rely on the library as anaffordable place where I know my kids will be safe. Of allthe programs to cut, the library should not be your firstchoice.Which statement best describes the authors point of view?A. The city should encourage better childcare optionsB. The city should find another way to save moneyC. The city should stop ignoring voters' opinions about librariesD. The city should expand library hours. I will give BRAINLIEST to whoever answers correctly first!!!Sophie wants to buy a pair of scissors that cost $1.82. If she gives the cashier a five dollar bill, howmuch change should she get back? Examine a product that has recently changed prices when you were at the grocery store in the past week. Analyze one determinant of supply and demand that has created the price to increase or decrease in your example. How did the change in demand or supply affect the market price in your example For a rollerblading party there are 50 tickets available. Jason buys 6 tickets and Heather buys three times as many as Jason bought. How many tickets are left to be sold?Show your work What would you like to change about yourself if you can? Read Josh's draft.Floating EntertainmentDuring the mid-19th century, before television or movies existed, people enjoyed forms of entertainment that are no longer common today.For example, people who lived in areas along the Mississippi River that were far from large cities depended on showboats. Showboats were boatson which plays were performedAn actor named William Chapman was the first person to build a showboat. He called his showboat the "Floating Theater." Actors lived onthe boat and traveled along the river. The showboat stopped at small towns to perform plays.Showboats were very popular but were discontinued when the Civil War began in 1861. They became popular again in the late 1870s.However, by the early 1900s, many settlements along the Mississippi had grown into larger towns with dance halls and movie theaters. As a result,Mississippi showboats began to lose their appeal. By 1910, people were heading to movie theaters big time.Josh wants to revise his last sentence.Is Josh's decision to revise his last sentence correct?O 1. No, because the information in the sentence provides a strong conclusion,O 2. No, because the information in the sentence is essential to the topic's main idea.O 3Yes, because the sentence includes a factual statement instead of a personal opinion.4. Yes, because the sentence contains slang and differs in style from the rest of the draft.Question #4Language 2-12 CA 2010 Helpp please due at 12:00 evaluate 999^3 by using suitable identity f(x) = 3x - 4x is -2