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## Robert C.'s Resources

This is a polynomial with 2 terms. The minus sign in front of the 9 indicates subtraction. Everything before that minus sign is the first term and everything after that minus sign is the second term.   Each term consists of a series of things being multiplied together. When no other...

Hi Andrew. You asked "In the equation below that one. How does that 5 get there before the O?" Some of the numbers, called coefficients, are determined from experiments. The others are filled it to make it balance. Consider this reaction: 1 C3H8 + 5 O2 = 3 CO2 + 4 H2O At...

This IS a hard problem to approach without a picture. I will take a stab at it. I will not put in any hydrogens unless needed for clarity. Assume there are as many hydrogens present as needed to give every carbon 4 bonds. The base molecule is hexane, which has 6 carbons all single bonded:   C-C-C-C-C-C   3-bromo...

Liz, you are very close. With 0.134 L you have calculated the number of moles of N2 gas you need to fill a 3 L container at STP. The equation tells you that every 2 moles of NI3 gives you 1 mole of N2. That means you need twice as much NI3. Multiply your answer by 2 to get the number of...

We want to get p by itself on one side of the equal sign. We can add, subtract, multiply, and divide as long as we do it to both sides.   First, distribute the 2: -p + 10 =2(p +8) -p + 10 =2p + 16 Now add p to both sides to get rid of the p on the left. -p...

The best way to see the slope is to put each equation in the slope/y-intercept form. To do this, solve for y. One of these equations is already in the slope y-intercept form but the other is not. The slope/y-intercept form looks like this: y=mx+b M is the slope and b is the y-intercept...

Hi Dianne, I get 25. I have spotted a few errors. "3 times -2 squared times 10 plus 5 = -115" This is: 3 • (-2)2 • 10 + 5 = 3 • 4 • 10 + 5 = 12 • 10 + 5 = 120 + 5 = 125 For the divisor (denominator), you say "-7 to the 0 power is...

We are given three pieces of information. The hare's speed, the tortoise's speed, and the head start that the tortoise has. The units are feet/second for speed and feet for distance. Time will then be in seconds. The principle is DISTANCE = RATE • TIME, or D = R • T The rate is...

KCl is a neutral SALT. It is ionic and is usually called a compound, not a molecule. (Molecule refers to the smallest unit of a covalent bond containing compound. The atoms in KCl undergo ionic bonding.) Potassium and all the other group IA elementas (lithium, sodium, cesium, rubidium,...

Stephanie is correct. I only wish to add to her answers. The +2 charge on platinum is indicated by the oxidation number in "Platinum (II) Acetate." The roman numeral II (2) indicates the oxidation state of the platinum.  There are other oxidation states possible, such as +4...

62 = 6 x 6 = 36 The standard form of 6 to the second power is 36. The exponential form is 62. The factor form is 6 x 6. Hope this helps, Robert

I think problem 3 will let me show you a general technique that can be used for all of these problems. -4(2-3x)= 7-2(x-3) Let's expand everything that is in parentheses using the distributive property. On the left side of the equation, the -4 is being multiplied by everything inside those...

I'm no expert on manhole covers. I assume the brass grip-strip runs around the outside edge of the cover. The perimeter of the circular cover is the length of its outside edge. It is also known as its circumference. Call C the the circumference and D the diameter. The formula that relates the...

I like Kerrie's answer, as long as the scores are discrete, integer data. It appears you have discrete, integers. If that is not the case, then read on: If the missing score can be any number greater than 5 and less than 9, then plug 5 and 9 into Kerrie's equations intead of 6 and 8; also change...

What is an MP(Member of Parliament)? There are many kinds of governments in the world. Parliamentary governments are where a group of representatives vote to make law and policy for a nation. There are many variations of this kind of government. In many European democracies, the representatives...

There are branches of mathematics where division by zero is defined as infinity. Those branches have severe limitations in solving most real world problems. Let us define division by zero and see what happens. X/0 = Y Now if we accept that any number times 0 is 0, we have problem. (5)0=0 (4)0=0 Therefore...

An identicalquestion was asked a few weeks ago. You can see my solution here: https://www.wyzant.com/answers/717/starting_at_1pmthe_temperature_changes_-4_degrees_per_hourhow_long_will_it_take_to_reach_-1degrees

I am going to spell out each property along the way. x/2 = 2 Multiply both sides by 2. The Multiplication Property of Equality allows us to multiply both sides by the same number. The Multiplication Property of Equality says if a = b, then a·c = b·c. In this case, a is x/2 and b is the 2...

I like Daniel's explanation. I would only add that the lines are parallel.

Hello Anne. Without seeing the table, I'm not sure if I will be able to understand the whole problem. Here is my best. The table probably has two columns or two rows where the numbers go. One row might have temperature (t) values and the other would have amount or mass of chemical (m) values...