Posts by Jack

Total # Posts: 1,933

Science
Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens. A. Integumentary system B. Nervous system C. circulatory system D. endocrine system I think it is C

social studies
Thanks 100% :)

Math
Which proportion has cross products of 5*24 and 8*15? A. 5/8 = 15/24 B. 5/24 = 8/15 C. 8/24 = 15/5 D. 15/8 = 5/24

Math
Which ratio forms a proportion with 18/30? A. 20/35 B. 50/90 C. 36/48 D. 60/100

Math
Which Ratios for a proportion? A. 4/9,12/25 B. 3/7,18/42 C. 5/11,20/45 D. 5/8,15/25

Math
Which Ratios for a proportion? A. 4/9,12/25 B. 3/7,18/42 C. 5/11,20/45 D. 5/8,15/25 Which ratio forms a proportion with 18/30? A. 20/35 B. 50/90 C. 36/48 D. 60/100 Which proportion has cross products of 5*24 and 8*15? A. 5/8 = 15/24 B. 5/24 = 8/15 C. 8/24 = 15/5 D. 15/8 = 5/24...

Math
Convert the map scale to unit rate. How many inches represent one mile? Show Your work. Interpret the meaning of unit rate. 3/10 in. = 7/8 miles

Math
Thanks

Math
286 miles in 5 1/2 hours

Math
Write the ratio as a unit rate

Math
Ok thanks

Math
Write the ratio as a unit rate. 8 meters in 10 seconds. A. 0.8 meter per second B. 1.125 meters per second** C. 2 meters per second D. 80 meters per second

History
Thanks!

History
What was the 54 mile civil rights march called that was after bloody Sunday?

Math
an object is moving along the x-axis such that the position of the object in masters at time t in seconds is giving by the function x(t)=t^3-12t^2+36t-5, for 0<=t<=8 a- when is the object moving right? and when to the left? b- When is the object's velocity both ...

Math
Thanks

Math
The cost in dollars of a class party is 59+13n, where n is the number of people attending. What is the cost for 44 people.

Math
Thank You

Math
d+g/h for d =35, g = 19, and h=6

Math
How do i do this with and without distribution?

Math
Thanks

Math
you want to buy three books that are on sale at 20% off. the original prices of the books are $2.50, $4.95, and $6.00. How much will you save? Calculation With distribution. Calculation without distribution.

History
Thank You

History
Why was northern Italy a natural birthplace for the Renaissance?

algebra
George is starting a new streaming music service. For a monthly fee, you can stream 50 songs. There is an additional charge for each song over 50. In August, Bill was charged $11.22 for 67 songs and in September he was charged $13.50. Write a function for the total charge. ...

Math
These two are correct i just finished the quiz.

Math
a) y=4 b) m=5 Would this be correct

Math
Solve using metal math. a) 4y+3=19 b) 2+3m=17

Math
One of the sides is 5.8 but would the other side go in the place of z. that is what i thought.

Math
There are not given 2 sides to divide. What do you mean.

Math
Solve the equation 5.8 = z/2.2

Math
Thank you so much

Math
Solve the equation 2.8x = -9.24

Math
I solved this. It is 18

Math
What Value of x is a solution to the equation? x-2 = 16

Math
Write an algebraic expression for the sum of 3 Coins and c Coins

Math
Evaluate -5g-6 for g = -2

MATH PLEASE HELP
Thank You

MATH PLEASE HELP
1) -5g-6 for g = -2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x-2 = 16 4) use mental math to solve the equation. z/-12 = -5 5) estimate the solution of the equation x-8.1 = 5.3 to the nearest whole ...

Math
I know how to do these now thanks

Math
or how to do them

Math
I really just don't understand algebraic equations like these

Math
1) -5g-6 for g = -2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x-2 = 16 4) use mental math to solve the equation. z/-12 = -5 5) estimate the solution of the equation x-8.1 = 5.3 to the nearest whole ...

Math
-5g - 6 for g=-2

math / science
a bacteria population doubles every eight minutes. if the population begins with one cell how long will it take to grow to 512 cells?

pre calculus
ohhhhh, i see! thank you for making it simple to understand

pre calculus
Double Angle Formula. If the double angle formula for cos2(u) = 2cos^2(u)-1, then write the double angle formula for cos2(u) in terms of sine.

art
keeping facial features in proportion means

Math
The track at Coolidge Middle School is 14 of a mile long. It takes Melissa 1 minute and 40 seconds to run around the track. How many minutes will it take Melissa to run 3 miles?

Science Please helpppp me!!
The answer is D) Multicellular. Hope this helps.

physic
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50 m in a straight line, reaching a final speed of 79 km/h. Determine the cheetah's average acceleration during the short sprint. m/s2

CHEMISTRY
2HBr+Mg(OH)2 -> MgBr2+2H2O how many mL of a 0.2 M HBr solution is required to react with 40 mL of a 0.40 M Mg(OH)2 solution

math
simplify 8/2 + 9 (12 divided by 3x2)-7 explain each of your steps i thought it was 1

math sequence
5th term for recursive sequence: a(1) = 1 a(n+1)=3a(n)-1

grammar
Is this correct? It is the waves, where... The "it is the waves" part. thanks

algebra
3x^4 + 5x^2 - 2 = 0 give imaginary and real roots rational roots theorem factors of (+-)p/q are possible rational zeros of function f where the coefficients of f are integers. how do you go about solving this?

Algebra
4x^2 - 13x + 3 How do you break this into groups? So far I'm having trouble with this type of concept. Please explain it, thanks!

Grammar
I apologize for asking too many of these questions, but I need to know for sure if I'm doing this right. "Thus the creation of infinite universes from this world of nothing was prevented." I'm confused if it is was or were again. When I say it to myself, I ...

Quotations
When starting a new sentence, do you add a capitalization at the beginning of the next dialogue format? Like this. He seemed to like it. "Mmm! This tastes good!" said Bardo. or "Mmm! This tastes good!" Said Bardo.

grammar
" This had never happened before. Usually he would be the one who wakes up the earliest. " Is there anything wrong in this sentence?

Grammar, sentence structure
"Yesterday was Aldo’s 15th birthday, friends and relatives travelled half a hundred miles by horse from the grand streets of Rome to have a dinner party." I'm having a very bad time structuring this sentence correctly so it can flow easily when speaking. ...

grammar
I like the new layout of the website. It looks very clean. I need help with this. "My family were of the middle class" Is this correct in terms of grammar? And is there a better way to write it?

Brains!
There are people who disagree though, but this is what I think!

Brains!
I agree. Your brain is like a hungry sponge and needs to constantly absorb information, and I think this applies to it. I don't think wasting "brain energy" is a problem since the brain uses representations and known examples to easily 'record' things.

Finance
First Inc. is facing a liquidity problem and needs to issue a perpetual bond that is callable only at the end of year 2. The call price is $1,000 (face value) plus an additional coupon payment. The current interest rate is 8% per year. At the end of each year, interest rate ...

rationalizing
sqrt(18) - sqrt(17) How does this expression equal 1/(sqrt(18) + sqrt(17)) ? How would you change it like that? And why is this good to use when not using a calculator?

composite functions
f(x) = 2/3x-1 g(x) = x+4/x (g o f)(x) = ? x does not equal 1/3 Can someone explain how to do this one?

Math--algebra 2
| x - 4 | < 3 rule -> |x| < a -> x < a, x > -a x - 4 < 3 and x - 4 > -3 solve x - 4 < 3 -> x < 7 solve x - 4 > - 3 -> x > 1 you have x < 7 and x > 1 combine, 1 < x < 7 #2 remember rule ^^ |5x - 2| > 5 remember the "...

math
to simplify (2sqrt(b)-sqrt(3a))(2sqrt(b)+sqrt(3a)) answer is -3a+4b. how would you get this?

algebra
The values from a stem-and-leaf plot are:27,27,29,33,38,44,44,44,46,50,58,in numerical order.Please explain how to find the lower quartile for this set. I would take the median of the first five values 27,27,29,33,38;this would make 29 the lower quartile.Is this correct? Is ...

algebra
The following stem-and-leaf plot values shows the average monthly sales commissions (in hundreds of dollars)for a major corporation's nationwide sales group : 27,27,29,33,38,44,44,44,46,50,58. What is the mode of this distribution? Thank You.

algebra
The following stem-and-leaf plot values show the average monthly sales commissions (in hundreds of dollars)for a major co rporation's nationwide sales group: 27,27,29,33,38,44,44,44,46,50,58. What is the mean of the distribution? Please show as much work as possible. Thank...

math
Emma is X months older than molly. If molly is 9 months old, write an expression for emmas age M= Months x= emmas age XM= 9 ?

Math
Oh, that makes a lot more sense thank you

Math
I still don't understand the second one, can you explain it more please? I've gotten to 1-sqrt 3+sqrt 2 but I don't know what to do next, or if it's wrong.

Math
Given that a and b are nonnegative real numbers such that a+2b=60, what is the largest possible value of ab? And If f(x) = x^2 - 3x + 4, find the value of f(sqrt3 - sqrt2). And The median of {20, x, 15, 30, 25} is 0.4 less than the mean. If x is a whole number, what is the sum...

Math
There are two cubes. Their lengths are in the ratio 3:4, what is the simplified ratio between their volumes?

Math
There are two squares. Their lengths at the ratio 2:3, what is the simplified ratio between their areas?

polynomials and zeros
5x^2 + 4x - 2 = 0 How would you solve this by graphing? Do you just draw a graph by finding x and y? The answer is -(2-sqrt14)/5, -(2+sqrt14)/5 There's no way you can just graph it and come up with these numbers by finding the integers of x. How would you do this?

Quadratic Equation (math)
-10x^2 + 7x - 1 = 0 Use factoring to solve

math
dependent or independent taking a quarter out of a bag and then taking another quarter out of the bag without replacing the first quarter

Physics 2
What quantity of heat is needed to convert 1kg of ice at -10C to liquid at 20C?

Physics 2
How many grams of steam at 100C must be mixed with 200g of water at 20C in order for the equilibrium temperature to be 50C?

plane geometry
a clock hangs on the wall. the wall is 71 ft and 9 inches long and 10 ft and f inches high. the night watchman notices that the hands of the clock are pointing in opposite directions and are parallel to one of the diagonals of the wall. what was the exact time

plane geometry
find the radius of the circle circumscribing an isosceles right triangle having an area of 162 sq. cm

circles
standard form - (x-a)^2+(y-b)^2=c^2 can someone simplify this instead then? x^2-2ax+a^2+y^2-2by+b^2-c^2=0? to make it general form

circles
Convert form standard to general form for circle. Circle with center (a,b) and radius c.

trigonometry
A ship started sailing 42.58 degrees west of south at the rate of 5 kph. after 2 hours, ship B started at the same port going 46.33 degrees west of north at the rate of 7 kph. after how many hours will the second ship be exactly north of ship A?

plane geometry
you forgot to write the formula.. lols

plane geometry
a triangle has sides equal to 68 cm, 77 cm and 75 cm, respectively. find the area of the escribed circle tangent to the shortest side of the triangle.

trigonometry
a triangle has sides equal to 68 cm, 77 cm and 75 cm, respectively. find the area of the escribed circle tangent to the shortest side of the triangle.

trigonometry
A ship started sailing 42.58 degrees west of south at the rate of 15 kph. after 2 hours, ship B started at the same port going 46.33 degrees west of north at the rate of 7 kph. after how many hours will the second ship be exactly north of ship A?

trigonometry
the angle of elevation of the top of the tower from the foot of a flagpole is twice the angle of elevation of the top of the flagpole from the foot of the tower. at the point midway between the tower and the flagpole, the angles of elevation to their tops are complimentary. if...

trigonometry
if the vertex of an isosceles triangle is 80 degrees and the side opposite the vertex measures 12 cm, determine the perimeter of the triangle

algebra
nestor has nickels, dimes, and quarters amounting to $1.85. if he has twice as many dimes as quarters, and the number of nickels is two less than twice the number of dimes, how many quarters does he have?

algebra
the sum of ages of maria and anna is 35. when maria was two-thirds her present age and anna was three fourths of her present ages, the sum of their ages was 25. how old is maria now?

algebra
if log xy=6 and log x/y=2. solve for x and y

math
sorry how did you get to the answer 25/8?

math
The inside of a trough is shaped like a rectangular solid, 25 feet long, 6 inches wide, and filled with water to a depth of 35 inches. If we wish to raise the depth of the water to 38 inches, how much water must be let into the tank? a. 25/96 cubic foot b. 25/8 cubic feet c. ...

Math
The graph shows the progress of a car which traveled 300 km in 5 hrs. Assuming that its speed remained constant, how far had the car gone after 2 hrs?

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