# 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?