# Posts by john

Total # Posts: 8,589

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 ...

-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

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.

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.

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...

History
Mel is 100%

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