Saturday

April 19, 2014

April 19, 2014

Total # Posts: 897

**Trigonometry**

ABC is a right triangle with AB = 2, BC = 3\sqrt{5}, AC = 7 and \angle ABC = 90^\circ. If \cos \angle BAC = \frac{a}{b}, where a and b are coprime positive integers, what is the value of a + b?

**Geometry**

Determine the number of subsets of A=\{1, 2, \ldots, 10\} whose sum of elements are greater than or equal to 28 .

**Geometry**

ABC is an acute triangle with \angle BCA = 35 ^\circ. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of \angle ABC (in degrees)?

**Geometry**

ABC is an isosceles triangle where AB = AC and BC = 60. D is a point on BC such that the perpendicular distance from D to AB and AC is 16 and 32, respectively. What is the length of AB?

**physics**

A cargo plane is moving with a horizontal velocity of vx = +225 m/s at a height of y = 920 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground? (Express your answer to...

**Algerbra**

8x+7=6 (subtract the 7 from left side) 8x=-1 (divide the 8 on both sibes) x= (-1/8)

**algebra**

D.

**physics**

YOU HAVE TO CHECK If Alice now applies QFT2n and measure, she will still get k with probability 99%. AND If she does as in the previous option, she will get k with probability 99%.

**math**

$8.00

**Math**

I think it should be x<=5/6 1. multiply thru by 5.... 2x-15x+10>=5x-5 2. combine like terms... -13x+10>=5x-5 3. get your variables on one side(-5x from both sides) -18x+10>= -5 4. isolate the variable... (-10..) -18x>=-15 5. /both sides by -18 !!careful!! whenev...

**hs geometry**

It's a proportion...53/63=x/67 in other words... st.height/st.shadow=tr.height/tr.shadow Solve by cross multiplying...63x=53*67 so x=56.37inches.. Good Luck!

**math**

64t^6 r^5g^3

**Physics**

Consider a pair of parallel plates with a potential difference of 12 V and are separated by 12 cm. What is the potential energy of a 1.0 C charge at point A, exactly 30. cm from each plate?

**math**

44c-4c^3

**Math**

Ms. Sue ???? i could have 0 toppings (that's 15).....or i could have 1 topping (x's 15 flavors) - that's 1215 ...or i could have 2 toppings 81x80(x's 15 flavors) that's 97200 more... Don't i have to get the sum of all of the combinations ??

**Math**

If I have 15 flavors of ice cream and 81 different toppings, how many different combinations could I create (assuming only 1 flavor of ice cream in the container at a time)? I got 36267774588438900000000000 ??? IS THIS RIGHT???

**Chemistry**

The specfic heat of iron is 0.11cal/g C. The heat of fusion of iron, the heat required to convert iron from a solid to liquid at its melting point, is 63.7cal/g. Iron melts at 1530 C. How much heat must be added to 2g of iron at 25c to completely melt it?

**Chemistry**

How many moles of gas are in a 30 liter scuba canister if the tempature of the canister is 300 k and pressure is 200 atmospheres?

**Chem**

I have a balloon that can hold 100 liters of air. If i blow up this balloon with 3 moles of oxygen gas at a pressure of 1 atmosphere, what is them tempature of the balloon?

**Chem**

How many moles of gas are in a 30 liter scuba canister if the tempature of the canister is 300 k and pressure is 200 atmospheres?

**Math**

I think you may have misread the question. Check to see if .005x^2 is actually -.005x^2. Then follow the directions above. When you graph the flight of an object it should be a parabola that opens downwards. Think of the graph as a side view of the rock where the x-axis is the...

**Math**

A rock band has 5 members, and 2/5 of the members play string instruments. Also, 0.4 of the members sing. Does the band have the same number of string instrument players as singers. I think no. Am i correct? Please explain it.

**Math**

I mean it

**Math**

Thank you

**Math**

What's 6/20 in simplest form? ( I know what simplest form is)

**Math**

the number can be divided by a greater sum then.

**Physics**

A pitcher throws a baseball with a horizontal velocity of 132 ft/s (90 mph) toward home plate that is approximately 60 ft. away. What is the vertical drop of the ball when it reaches the plate? g = 32 ft/s^2.

**Physics**

A long jumper leaves the ground with an initial velocity of 12 m/s at an angle of 28-degrees above the horizontal. Determine the time of flight, the horizontal distance, and the peak height of the long-jumper.

**Physics**

Train A starts at 4 miles South of a bridge and heads North at a constant speed of 30 miles per hour. Train B starts 6 miles North of the bridge. a. What velocity must Train B have so that the two trains cross the bridge at the same time? b. If Train B goes at 35 miles per hou...

**Physics**

A train is moving towards a destroyed bridge. The velocity of the train remains constant at 20 m/s. A person inside the train realizes that they will die unless they run to the back of the train and jump out. If the person is 15 m from the back of the train and the back of the...

**Physics**

At a certain instant, a ball is thrown downward with a velocity of 8.0 m/s from a height of 40 m. At the same instant, another ball is thrown upward from ground level directly in line with the first ball with a velocity of 12 m/s. Find (a) the time when the balls collide and (...

**Physics**

A plane is flying at 25 degrees north of west at 190km/ h. Suddenly there is a wind from 15degrees north of east at 45 km/ hr. what is the planes new velocity with respect to ground in standard position

**Physics**

Plane flying southwest at 155mi/hr. their is a wind from the west at 45.0mi/hr. what's the planes new velocity

**MaTH**

so is the perpendicular line is -2/3? What is the parallel line?

**MaTH**

Consider the line 9x-6y=-3 . What is the slope of a line parallel to this line? What is the slope of a line perpendicular to this line?

**Mth**

I suck in math as you can see and yes I will love more help

**Math (Pre-Cal)**

There is exactly one triangle the length of whose sides are integers in arithmetic progression and whose area is 156 square units. Find the perimeter of this triangle.

**Math**

An airplane approaches a runway at a 3 degree angle of depresssion. If the plane is flying at 30,000 ft., find the ground distance from the airport to the point directly below the plane when the pilot begins the descent. Round your answer to the nearest foot.

**Math**

An airplane approaches a runway at a 3 degree angle of depresssion. If the plane is flying at 30,000 ft., find the ground distance from the airport to the point directly below the plane when the pilot begins the descent. Round your answer to the nearest foot.

**Biochemistry**

Do you add Nacl or HCL if your target buffer pH is 8, and the buffer is HEPES

**Physics**

Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 433 N and F2 = 354 N. (Assume up and to the right as positive directions.) F1 is 10 degrees west of the y axis, F2 is 30 degrees east of the y axis. (a)What is the direction &...

**Physics**

Forces of 11.3N north, 19.1N east, and 14.5N south are simultaneously applied to a 4.12kg mass as it rests on an air table. What is the magnitude of its acceleration? What is the direction of the acceleration in degrees? (Take east to be 0 degrees and counterclockwise to be po...

**Physics**

A rowboat crosses a river with a velocity of 3.30 mi/h at an angle 62.5° north of west relative to the water. The river is 0.795 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore?

**MATH**

THREE QUARTERS OF A POUND OF HONEY COSTS $4 HOW MUCH HONEY WOULD YOU GET FOR $6

**Trigonometry**

cos 17pi/6 + tan 17pi/6

**Physics**

compare the collision of a baseball and bat with the collision of a baseball and a fielder's glove when the baseball is caught. During which collision is there a greater momentum change for the baseball?

**math**

what is 0.0678/100

**Physics**

Question: particle J with zero initial mass and X energy accelerates from a static start to 'C' (light speed) in a time frame of N and mass increases 10 to the 28th power per nanosecond- -What is the mass on particle J? -What is the energy of particle J?

**PLEASE HELP BIO**

If the side chain of a glutamic acid residue has a pKa of 4.1, at pH 6.1 the ratio of uncharged to charged side chain would be about A. 100:1 B. 10:1 C. 1:1 D. 1:10 E. 1:100 -i HAVE NO IDEA Which of the following amino acids has a side chain that can serve ONLY as a hydrogen b...

**biology**

If the side chain of a glutamic acid residue has a pKa of 4.1, at pH 6.1 the ratio of uncharged to charged side chain would be about A. 100:1 B. 10:1 C. 1:1 D. 1:10 E. 1:100

**biology**

Which of the following amino acids has the most hydrophilic side chain? A. F B. Q C. V D. M E. A

**biology**

Which of the following amino acids has a side chain that carries a negative charge in its conjugate base form? A. H B. W C. C D. K E. N

**physics**

The largest-caliber antiaircraft gun operated by the German air force during World War II was the 12.8 cm Flak 40. Suppose this weapon fired a 26.2 kg shell with a muzzle speed of 800 m/s. What propulsive force was necessary to attain the muzzle speed within the 6.00 m barrel?...

**Physics**

Find the speed, v, of a pendulum at the bottom of its swing (B), given that it has mass m and initial height at A is h (the difference in height from B to A). Your answer will be in terms of g as well. Included is a drawing of a pendulum at its maximum height (A), and at its m...

**Linear Algebra**

Can you perform using matrix? Thank you very much

**Linear Algebra**

Consider the system x-2y=k-1 4x+(1-k^2)y=8 For what values of k does the system have a. unique solution? b. infinitely many solutions? c. no solution?

**math steve**

steve can you explain step by step please 8x=5y and 3y=14z then 12x= how many z's

**math**

if 8x=5y and 3y=14z then 12x= how many z's

**calculus**

A 100 inch piece of string is cut into 3 pieces. One piece forms a circle, one forms a square and 1 forms an equilateral triangle. If the perimeter of the triangle is equal in length to the perimeter of the square how long should each piece of string be to minimize the total a...

**math**

compare two cell phone companies and determine which is the better deal. Needs to be in a y=mx+b equation for each company. company a $40 base rate plus every minute costs .05 company b base rate $30 plus every minute costs .07 based on 800 minutes PLEASE HELP ME ASAP!

**Chemistry Help**

Write a balanced equation for the reaction between an aqueous solution of calcium nitrate being mixed with an aqueous solution of sodium phosphate Identify the precipitate.

**Finance**

Arena Distributors is a new company and currently pays no dividends. The company has just reported earnings of $1.5 per share and its earnings are expected to grow at a 15 percent annual rate over the next four years. Following this four-year high growth period earnings will g...

**Finance**

Seven years ago a semi-annual coupon bond with a 10% coupon rate, $1,000 face value and 15 years to maturity was issued by Corn Inc.. Teddy bought this bond two years ago when the market interest rate was 12%. And now the market interest rate is 5%. If teddy sells the bond now...

**math URGENT!!!!!!!!!!!!**

a 12x12-inch square is divided into n^2 congruent squares by equally spaced lines parallel to its sides. circles are inscribed in each of the squares. find the sum of the areas of the circles. answer and please explain step by step how u got the answer!! please!!!!

**com sci**

A rational number is the form of a/b, where a and b are integers with b != 0. Develop and test a class for processing rational numbers. The class should have a numerator data member and a denominator data member. It should read an display all rational numbers in the format a/b...

**physical**

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts on each of is feet an...

**Physics**

Which one of the following stresses would be most likely to cause a bone to fracture? A) tensile stress B) compressive stress C) sheer stress D) bulk stress

**math URGENT!!!!!!!**

a rectangular sheet of paper is folded in half, with the crease parallel to the shorter edge. it happens that the ratio of longer side to shorter side remains unchanged. what is this ratio? answer this and explain how u got the answer.. PLEASE??!

**Computer Science**

Overview The purpose of the assignment is to develop a basic understanding and skills programming of input/output ports and device polling. The assignment examines hardware polled input from a push button. Assignment 1 The assignment is based on the flashing LED of the MSP430 ...

**math**

Alexa and Emma are looking up at their house from the backyard. From alexa's point of view, the top of the house is at an ang;e of elevation of 40 degree. From Emma's point of view, directly closer to the house, it is 60 degree. The house is 15 metres high. How far apa...

**math URGENT!!!!**

please show how u got the answer

**math URGENT!!!!**

i have a list of 5 different numbers. the sum of 2 of the numbers is 0. the sum of 2 of the numbers is 1. the sum of 2 of the numbers is 2. the sum of 2 of the numbers is 3. the sum of 2 of the numbers is 4.the sum of 2 of the numbers is 5.the sum of 2 of the numbers is 6. the...

**math..reiny..help!!**

is that the area of big or small triangle?

**math URGENT!!!!**

the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. please answer and show how u did it step by step please!!!! how do i find area of the smaller triangle?

**math URGENT!!**

so is that the area of big triangle or small?

**math URGENT!!**

how do i find the area of the little triangle? Reiny,

**math URGENT!!**

the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. please answer and show how u did it step by step please!!!!

**Trig**

From a point 120 feet from the base of a plant building the angle of elevation to the roof line of the building is 38 degrees. The angle of elevation to the top of an antenna is 43 degrees. The antenna is attached to the nearest edge of the roof and the ground is flat. The hei...

**mathURGENT!!!!**

the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. what is the answer and can u explain how u got it step by step? please...

**math**

42 is evenly divisible by both 6 and 7

**math URGENT!!**

a rectangular box measures 4 by 5 by 2 meters. what is the length of the longest pole that can fit into the box?

**math**

how did u get that?

**math**

a rectangular box measures 4 by 5 by 2 meters. what is the length of the longest pole that can fit into the box?

**math**

amee, ben, carly, and darrien are friends. darrien has no money. amee gives darrien 1/4 of her money. ben gives darrien 1/5 of his money. carly gives darrien 1/3 of her money. each person gave darrien the same amount. what fraction of the groups total money does darrien have a...

**7th grade math**

b) 2 7/8 inches

**Math does anyone know this?**

they are parallel....two nonvertical lines are parallel if their slopes are equal and have different y intercepts..

**math - still don't get it**

your welcome! anytime :)

**math - still don't get it**

because as long as the number(4) is right after the decimal point it doesnt matter how many 0's are in front of decimal or after the 4. think of it in dollar amount 0.4 is 0dollars and 40 cents. .40 is still 0 dollars and 40 cents thus 0.4=.40 if it were a different number...

**math**

its equal to...

**math**

can u explain that a little further steve?

**math**

describe the picture you would get by graphing the solutions(if there are any!) to the equation (x+y)^2=x^2+y^2

**math**

there are 15 boys and 18 girls in fifth grade. Find the ratio of boys to girls in fifth grade.(how do I get the answer) can someone show me how to work the problem

**math**

is there an equation for this?

**math**

an object released from rest will fall 16t^2 feet, t seconds after it is dropped. 2 pebbles are dropped, one after the other, from a cliff that is 64 feet high. the 2nd pebble is released the instant the first pebble has fallen exactly one foot. how far above the ground is the...

**math**

consider the equation x^2+kx+1=0 a single fair die(dice)is rolled to determine the value of the middle coefficient, k. the value for k is the number of dots on the upper face of the die. what is the probability that the equation will have real, unequal roots?

**Physics**

A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? Equation to use?

**Physics**

A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? What equation would I use for this?

**trigonometry**

Suppose θ is an angle in standard position whose terminal side lies in Q II. If sin θ = 13 12 , find sec θ.

**physics**

An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?

**physics**

An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?

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