# Posts by Sylvie

Total # Posts: 27

**Chemistry**

How much heat is needed to raise the temperature of 5.58 kilograms of iron from 20.0°C to 1000.0°C? Specific heat of iron is 450,000 J/(kg x °C). Type the correct answer to 3 significant digits.

**chemistry**

what mass of the following compounds will dissolve in 200g of water at 30 degrees Celsius a) CuSO45H2O b) KNO3 c) NaNO3 how do a work it out, thanks

**English**

Commas: Do I need a comma between the words notes and so? - "Sitting at the sticky, crumb-covered cafeteria table, Luther and Ruth carefully studied their chemistry notes so that Dr. Wilson's next tricky test wouldn't confuse them." Do I need a comma between ...

**Algebra**

Natalie earns $2.50 for each CD she sells and $3.50 for each DVD she sells. Natalie sold 45 DVDs last year. She earned a total of $780 last year selling CDs and DVDs. Write an equation that can be used to determine the number of CDs (c) Natalie sold last year. How many CDs did...

**Algebra**

Express the radical as a power. Then evaluate it. Round to the hundredths place. I can't figure out how to type the symbols on my computer, but there are 3 problems. 1) 795 "square-rooted to the 3rd power" 2) 9876 "square-rooted to the 5th power" 3) 845...

**Algebra**

Show how you substitute the values into the formula, then use your calculator. *Use A = P(1+r/n)nt to find the amount of money in an account after t years, compounded n times per year. *Use I = Prt to find the amount of simple interest earned after t years 1) If a person ...

**Algebra**

Is it possible to find a value for c so that the linear system below has exactly one solution? Explain. 5x+3y= 21 Equation 1 y= -5/3x+c Equation 2

**Algebra**

What is the x-coordinate of the solution of the system y=1/3+8 and 2x-y=2?

**maths-urgent**

6.0 lengt 3.2 width volume 96 what is the height

**algebra**

Write the standard form of the equation of the line through the given point with the given slope. Through: (3,-1) and (8,-4)

**algebra**

If an equation is an identity, then the solution to that equation is _______.

**algebra**

Find the unit rate in qt/day: 20 fl oz/min

**algebra**

5h+2(11-h)= -5

**Algebra**

You and your friend live 12 miles apart. You leave home at the same time and travel toward each other. You walk at a rate of 4 mph and your friend bicycles at a rate of 11 mph. A) How long after you leave home will you meet? How far from home will each of you be? B) Suppose ...

**6th grade**

Scientists have calculated that the Moon's revolution around Earth is increasing by about .015 s per century. At this rate, how long would it take the length of a month to increase by one full day?

**math - 5th grade**

Hello: I am having difficulty witht the following math: Question #1 If the area of a circle is 27 sq. in. What is the radius? I am coming up with an answer of 13.5 sq. in. Is that correct? If not, can you show me step by step how to get the answer? Question #2 If the area of a...

**math**

Thanks very much.

**math**

The number of boys in a certain class exceed the number of girls by 7. If the number of boys is 5/4 of the number of girls, how many boys are there in the class? The choices of answers are: a) 21 b) 28 c) 35 d) 42 e) 63 I figured out that the answer is 35, but I did it by ...

**english**

I appreciate your suggestions comments. Thanks so much.

**english**

I have to do a project on 4 types of writing. Fictional narrative, Personal narrative, Informational writing and Persuasive writing. The project consists of giving characteristics of each, as well as 2 prompts (examples) for each. This is what I have so far. Please tell me if ...

**Science/Cars**

What are two examples of indirect water usage that get a car to start? I know really nothing about car engines, so I don't know what parts of cars use water, or how they use it. Thanks for explaining this.

**English**

Is a movie title italicized, put in quotes, or underlined? I've googled this and looked in books, but I've heard different things. What is the most recent rule? Thanks.

**English**

In these two sentences, I'm not sure where to put the apostrophe to make it a plural possessive noun. We were excited to see the (children) photographs. The pictures looked like real (photographer) pictures.

**English**

In this sentence Plenty of silicon is found on Earth, but it remains a valuable material for the computer industry. I'm still not sure if the simple subject is plenty or silicon, but I think it's silicon because the second part of the sentence says it.

**English**

In this sentence Plenty of silicon is found on Earth. I'm not sure if the simple predicate is is or is found.

**English**

yes, but I'm not sure if the simple predicate in clause 1 is is or is found.

**English**

In the sentence - Plenty of silicon is found on Earth, but it remains a valuable material for the computer industry. What is the simple subject and predicate?