# Posts by John

Total # Posts: 8,421

**science**

Oh and last thing is how does half-life work

**science**

What is the geologic time scale and what are some thing scientists use it for (at least two things)? Here's my answer could you please verify. the geologic time scale is a record of the geologic events and life forms in Earth’s history. Scientists use it to understand...

**Math**

Kenny reads 4/9 page in 3/4 minute Kenny's unit rate is (what) page per minute

**Math, Algebra**

you are welcome

**Math, Algebra**

(3y-6)/3 <= -6 3y-6 <= -18 3y <= -24 y <= -8 (4y-8)/2 > 6 4y-8 >12 4y > 20 y > 5 with OR the solution is y is less than or = -8 or y>5

**Maths**

x= larger y= smaller x-y = 24 x= 4y 4y -y =24 3y = 24 y = 8 x = 32

**Math**

x + y = 27 x = 2y 2y + y = 27 3y = 27 y = 9 x = 18

**Matg**

15 4/4 -10 1/4 = 5 3/4 5 3/4 + 7 2/4 = 12 5/4 = 13 1/4

**Algebra 1**

3.25 + .65x <= 6 .65x<= 2.75 divide by .65 to get your answer.

**Math**

g = 24+C c = a +35 a+g+c =100 can you finish from here?

**math**

30/18 = L/27 5/3 = L/27 3L = 5(27) L = 45

**Math**

10 times 25 = 250 200 + 250 = 450 feet blow

**Math**

.5 = 5/10= 1/2 3/8 is less than 1/2 18/8 = 2 1/4 or 2.25

**math**

5 times 1.8

**Maths**

You want factors of 4 and -3 since they multiply to equal 12 and add to be the 1 in front of the x. you should have x = 3 and x = -4 When I worked with the first and third, I got (x-3)(x+2) x = 3 x = -2 so the x=3 showed up twice. Substitute it in each of the 3 equations to ...

**Math please help**

-x/(x-5) + 7x/(x^2 -3x-10) -x/x-5) + 7x (x-5)(x+2) The first fraction needs a denominator of (x-5)(x+2) Multiply the num and denom by x + 2 -x^2 -2x +7x = -x^2 +5x num over (x-5)(x+2) num factor -x(x-5) cancel the x-5 -x/(x+2)

**math**

7. The tennis team is selling key chains as a fundraiser. If its goal is to raise is at least 180, how many key chains must it sell at $2.25 each to meet that goal? Write and solve an inequality. a. 2.25k (greater than or equal to) 180; k (greater than or equal to) 100 b. 180k...

**math**

On a 28-question test, there are 2-point questions, 4-point questions, and 5-point questions. The test is worth a total of 100 points. There are twice as many 2-point questions as 5-point questions on the test. How many 2-point questions are on the test?

**English**

Some have more than a hundred and some have none, its very colourful and you see it every morning someone please tell me the answer

**Grammer**

“I don't know, but it's hanging by its feet,” chirped Flitter

**Grammer**

What is the simple subjects and simple predicates?

**Grammer**

i don't know, but it's hanging by its feet chirped flitter What is the complete subject and complete predicates

**Economics-Macro**

Suppose you borrow $100 of principal that must be repaid at the end of two years, along with interest of 4 percent per year. If the annual inflation rate turns out to be 8 percent, (a) What is the real rate of interest on the loan? (b) What is the real value of the principal ...

**Economics-Macro**

Help please?

**Algebra2**

It looks like inverse, x doubled from the 1st to second point and y became 1/2 as much. from 5 to 15 tripled 2 to 2/3 became 1/3

**math**

1/2 (n) - 6 = 4 add 6 then divide by 2.

**6th grade algebra**

To get the number of feet you have to take the square root of 7410 then divide that answer by 13 to get "h"

**Math**

5280 feet = 1 mile 90/5280 = what part of a mile 60 seconds in 1 minute and 60 minutes in 1 hour divide 1.9/3600 what part of an hour to get mph, divide the first answer by the second.

**Statistics**

10 disks 7 or 8 makes 2 possibilities 2/10 = 1/5

**MATH**

8 divided by 5 = 1.6 so 1.3 is not correct.

**Math**

I agree.

**math**

d = rt 360 = (x -t)33 360= (x+t)22.25 360 = 33x-33t 360 = 22.5x - 22.5t Can you solve from here?

**Science**

use fltrationm. go away. let it blow up and let water pass through

**Math**

(12-9)/sd = 2.5 I got 2.5 by finding the inv of .0062 3/sd = 2.5 3/2.5 = sd sd = 1.2

**Statistics**

A confidence interval is found by adding and subtracting the margin of error. If we take the difference of 235.1 and 197.2 and divide by 2 we have the margin of error. this margin of error is found by taking 1.96 times the standard deviation. To find the standard deviation ...

**Math**

Do you mean something like (10-2) x 25 = 250 -50 = 200 then 200 (20-3) 4000 - 600 = 3600

**Statistics**

0 because if all scores are 80 the mean is 80 and all values are 80 so there is no spread in the data.

**Statistics**

a) a 30 instead of a 3 gives us more variability in the data.

**Physics**

An automobile leaves the store, first going south at 88 km/h for 2 hours, and then turns on a road heading 20 degrees east of north at 55 km/h for 1.5 hours. Calculate the (x,y) components of the net displacement of the automobile from the starting position, where the x-axis ...

**Math**

65t -50t =97.5 15t = 97.5 divide by 15 to find time in hours

**math**

(1/7)^4

**math**

This is a right triangle. The legs are (x+20)1 and 1x (x+20)^2 +x^2 = 450^2 2x^2 +40x + 400 = 202500 2(x^2+20 x + 200) =202500 x^2 + 20x + 200 =101250 x^2 + 20x -101050 = 0 Can you finish from here?

**algebra**

The line has a slope of 3 because y = mx+b where m is the slope. Perpendicular lines have slopes that are negative reciprocals. So we have a 3 which makes our perp line's slope -1/3 If you multiply the two slopes you will always get a -1 if the lines are perpendicular If ...

**Math**

Scientific notation always leaves one number to the left of the decimal .62 x 10 ^2 move the decimal point 1 place to the right to get 6.2 and now the exponent becomes 1.

**Geometry**

(3, 5) (5, -11) (x, y) 5 -3 = 2 so the x value should be 2 more than the midpoint (2,y) -11-5 = -16 difference so we need a difference of -16 from the -11 (2,-27)

**Algebra 2**

We have to see the table. I do know that a probability is always between 0 and 1. It looks like the only possible answer is 2/3. That is just a guess.

**Algebra 2**

without the table or a good description... I can't help.

**Maths**

1000 = k5^3 1000 = 125k 1000/125 = k k = 8 64 = 8 q^3 8 = q^3 q = 2

**Geography**

What are 3 types of zone?

**Math**

Where would I put parentheses to make this true? 7-3x4+6=27

**Science**

What is a bird speed flying at 12 m/s with a crosswind at 20 m/s

**Math**

each person gets 1/3 of the kites since there are 3 kites, each person gets 1 kite.

**Statistics**

I believe the E-4 is tell you to move the decimal point 4 places to the left. .000812 is less than .01 Remember all probabilities will be between 0 and 1.

**spanish 2**

Please fill in the blanks with the correct spanish form of the word in pernethesis!!!! Help Hoy yo______(ir) a un guateque campesino. ______ (ser) un ________ (event) especial en Cuba. Hay mucha _________ (food) y _________ (music). Yo _______ (estar) muy ___________ (excited...

**History**

i wish i knew

**Statistics**

Suppose systolic blood pressure (the higher of the two blood pressure readings) of a large group of individuals is normally distributed. If the mean is 122 and the standard deviation is 20, then

**algebra**

(x-1)/6 = 1/3 3x-3 = 6 3x = 9 x = 3

**Math**

16 + 7 = 23 oz. the other piece ways 12 oz.

**PLEASE HELP ME**

It is the median and it is not misleading. The $23.50 is an outlier. find the middle of the data it falls between 9 and 9.50

**math**

Whenever you multiply or divide across an inequality by a negative number, you change the direction. Think about 2 > -4 Multiply both sides by a -3 -6 > 12 NO... change the inequality -6<12

**Management**

low price

**Management**

If time is running out to finish the operational-planning process before the start of the new fiscal year, it should be cut short with the resolve to start earlier the next year. true or false?

**Mathematics Help**

35 females + 11 males who got a C 46/64 =

**algebra**

150-(65+20g)

**maths**

15(35.75)+16(42.25) = James total 25(35.75)+10(42.25) = Sally's total 18(35.75) + 13(42.25) = Andres Find the amounts then subtract the smallest from the largest.

**Math**

What is the standard form of five and three hundred fifty-two thousandths? 1: 5.0032 2: 5,352,000 3: 5.352 4: 5.30052000 Is it two?

**maths**

4, 6,7, 8 in the ten thousands 0,1,2,4,6,7,8 can be used in the thousands hundreds and tens could use any of the digits ones would have to be 0,2,4,6,8 if we can repeat the digits then 4 times 7 times 7 times 7 times 5 The only problem is that we don't want to have 40000 ...

**math**

A = lw 96 = (w+4)(w) w^2 + 4w -96 = 0 (w +12 )(w-8) =0 w=-12 cannot have a neg value here w = 8 so l = 12

**Math**

Jai = julia + 2/5 julia I am not sure what you mean by the next sentence.

**Math**

P = B+12 (P-1) = 3(B-1) P-1 =3B-3 substitute for P using first equation B+12-1 =3B -3 14 = 2B B = 7 P = 19 last year they were 6 and 18.

**STATISTICS**

true positive happens 96% of the time. Multiply .006 times .96 false positive .006 times .04 add the two together.

**Statistics**

c) When you create a 99% confidence interval this indicates that If you made many intervals by taking samples of the same size from a population then...99% of all of the intervals that you make will contain the true population mean. It would not contain 99% of the population. ...

**Math**

Thank you so much Bosnian!

**Math**

Find the product and explain the process and reasoning 0.67 x 0.3 Please help I don't know how I could explain this :(

**Engineering/Physics**

When gasoline is burned in the cylinder of an engine, it creates a high pressure that pushes on the piston. If the pressure is 150 pound-force per square inch, and it moves the 3-inch diameter piston a distance of 6 centimeters in 0.1 seconds...

**Physics**

Briefly describe the relative quantities of kinetic, gravitational potential and mechanical energy as a stone is thrown in the air vertically upward and falls to the person's hand at the same height that it left.

**math**

r/b = 3/5 5r = 3b 20 + r = b 5r = 3(20 + r) 5r = 60 + 3r 2r = 60 r = 30 b = 50 ratio is 30/50 or 3/5

**Chemistry**

Base = NaOH, 0.084 M drips 2ml at a time Acid = Phenol, KA=1.3*10^-10 You have 28.0 ml in flask, and it is 0.06 M How would you find the molarity and moles of OC6H5-1

**Math**

x + x +1 = -11 2x = -12 x = -6 x = -5 product = 30

**Math**

That means that you have to multiply 11 times itself 2016 times. You would need to use a calculator with 11 ^ 16.

**Algebra**

distance = rate x time 5 + 40x = 50x 5 = 10x x = 1/2 hr

**math**

F = 4J F+J>= 55 4J + J >= 55 5J >= 55 J = 11

**Math**

7 x 3000 and 7 x 4000

**Algebra**

Tell us what you think and we will check it.

**MATH**

The forty and the 9th term of an AP is -3 and 12 respectively. Find the common difference and some of the frist 7th term

**Chemistry**

An Unknown Compound (M=60.09 g/mol) is composed of Carbon, Hydrogen and Oxygen. Combustion of 0.255 g of the unknown compound produces 0.561 g Carbon Dioxide and 0.306 g of Water. Determine the molecular formula of the compound.

**math**

2) The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?

**psychology**

According to a survey in the U.S. in the 1990s, people in their 40s reported more lifetime sex partners than did people in their 50s. Which of these is the most likely explanation? a) People in their 50s were starting to lose their memory. b) People in their 40s had been young...

**psychology**

According to Hans Selye, stress is a) a specific response to a specific demand on the body. b) a cognitive, not physical, response to a threatening situation. c) any reaction that increases activity in the parasympathetic nervous system. d) a nonspecific response of the body ...

**psychology**

According to Abraham Maslow, what do we do when we have several motivations? A) We alternate between one and the other. B) We try to satisfy them at the same time. C) We are frozen with indecision. D) We start with the lowest need and work up. D Is my answer

**math**

john hiked 8 1/3 miles in 3 3/4 hours. what was John's average speed for the hike

**Math**

(3/4)pg/1 min = 3 pg/x cross multiply 3 = 3/4 x x = 4

**Stats,**

Put the values in order from lowest to highest. 25th percentile will have 1/4 of the data below that number. 90th will have .9 of the data below that nu

**Algebra**

7 more than 5 times a number is 10. Replace "a number" with something from the real world.

**STATS**

for anyone one question is .50

**math**

In a pet store there are 12 kittens for sale and 80 puppies. what is the ratioof the number of puppies to kittens ? write your answer as a fraction and reduce your result . thank you

**English**

I checked 1-9 and I agree with all of them except for the first one.

**math**

a^2 + b^2 = c^2 x^2 + 11^2 = 12^2 x^2 +121 =144 x^2 = 23 take the sq rt of 23 to find your answer.

**Math**

yes.

**Algebra**

Graph y = -|x -5| Make it a dotted line because the original problem is less than not less than or equal to. Let x=0 y=-5 x = 5 y = 0 x = 4 y = -1 shade