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 Question 139518: hello....I am stumped...hope you can help...Question: Assume Joe Ball hits a major league pop-up (straight upward) on a Johnny Bench 90mph pitch. The function that describes the ball's height (in feet/second) is: h(t) = -16t^2+132t h(t) is height, t = is seconds...How many seconds for the ball to go up and back down? How high does the ball go? I came up with answers 4.125 for ball to go up and down and 272.25 feet for how high ball goes up (correct??)...but here's the stumper: it's now asking to repeat problem using planet Mercury. How do I complete this? (FYI, Mercury is 38% of Earth)....Hope you can help and show me the correct formula and answers..Thank you Click here to see answer by Earlsdon(6287)

 Question 139522: How would I solve this using quadratic formula? g(x) = x^2 + x + 12 Click here to see answer by solver91311(16877)

 Question 139520: What do I solve this by factoring? 49x^2 - 14x - 3 Thanks! Click here to see answer by jim_thompson5910(28593)

 Question 139519: What do I solve this by factoring? 20x^2 + 13x + 2 Thanks! Click here to see answer by jim_thompson5910(28593)

 Question 139544: t to the 4th power - 6t squared - 4= 0 Click here to see answer by solver91311(16877)

 Question 139462: What are the dimensions of a rectangle that has a perimeteer of 42 meters and an area of 90 square meters. HELP! Click here to see answer by checkley75(3666)

 Question 139568: Why is it called algebra? Why is algebra useful? What does an algebra problem look like? How are algebra problems different? Click here to see answer by solver91311(16877)

 Question 139615: If the equation of a circle is x^2+y^2+3x-my+10=0 and the point (2,-5) lies on the circle, what is the value of m? I think it is -6??? Click here to see answer by stanbon(57307)

 Question 139645: Find the side of a square with an area of 625 ft.^2 by using a quadratic equation. I know that to find the area of a square you do length times width and all sides of a square are equal so I found the square root of 625, which was 25. But I am not sure on how to solve this problem using a quadratic equation. Thanks!! Click here to see answer by stanbon(57307)

 Question 139635: HELP NO clue how to do this! An eagle is circling a field at a height of 250 feet sees a snake below. The eagle dives at an initial speed of 110 feet per second. Determine the time the snake has to escape. Click here to see answer by stanbon(57307)

 Question 139753: What is the vertex? How do you find the vertex? y=x^2+x-12 Click here to see answer by solver91311(16877)

 Question 139623: What are the pros and cons of solving quadratic equations using graphing, using the quadratic formula, completing the square, and factoring. Click here to see answer by ankor@dixie-net.com(15649)

 Question 139689: Ethel tosses a softball upward. When the ball leaves her hand 5 feet above the ground it has an initial upaward velocity of 66 feet per second. How high can Ethel toss the ball? HeLP! Click here to see answer by ankor@dixie-net.com(15649)

 Question 139775: x2+4x-21=0 trying to find the two solutions??? I was fine till c was a value... when c = o I had no problems solving now that c = a value.. im stuck help i can get this far: a=1 b=4 c= -21 -4+_ 4sqd + 4(1)(-21) divided by 2(1) then, -4+- 4sqd + -84 divided by 2 then i get confused.... help Click here to see answer by jim_thompson5910(28593)

 Question 139631: The revenue R (in millions of dollars) of a large retail store can be modeled by R=1.23t^2-2.22t+8.5, where t is the number of years since 1990. Estimate the year in which the store's revenue will reach 90 million dollars? HELP!! Click here to see answer by ankor@dixie-net.com(15649)

 Question 139858: A ramp-to-ground motorcycle jump can be modeled by the quadratic function h = -0.0022d2 + 0.46d + 19, where d is the distance in feet along the ground from where the motorcycle left the ramp and h is the height of the motorcycle in feet. How long was the jump? Round your answer to two decimal places. The units will be typed in the second box. Click here to see answer by stanbon(57307)

 Question 139966: A parabola passes through (-2,0),(4,0) and (5,14). Find the equation of the axis of symmetry. Find the equation of the line perpendicular to the Y-axis that passes through exactly one point of the parabola. find the equation of the parabola. I just do not know where to start, what to look for first. Please help. Thankyou. Click here to see answer by scott8148(6628)

 Question 140056: A ball is thrown vertically upwards from the balcony of an apartment building. The ball falls to the ground. The height of the ball , h metres, above the ground after t seconds is given by h=-5t^2 +15t +45. What is the height of the balcony? 45m? What is the maximum height reached by the ball? When will the ballreach a height of 55m? When will the ball hit the ground? Click here to see answer by rapaljer(4667)

 Question 140075: three man can finish a painting job in 8 days. This job can be finished by 5 women in 6 days and by 8 boys in 10 days. how long will it take 1 man 2 women and 3 boys working together? Thanks! I will make a donation to you for your help. Click here to see answer by ankor@dixie-net.com(15649)

 Question 140112: If 6 is added to a number and then subtracted from the same nunber, the product of the sum and the difference 189. What is the number? Totally stumped Click here to see answer by jojo14344(1512)

 Question 140326: The difference between two positive numbers is 4. If twice the square of the larger number is added to three times the smaller the sum is 53. Solve. This is what I have x - y = 4 2x squared + 3y = 53 This is where I got lost. Thank you Click here to see answer by ankor@dixie-net.com(15649)

 Question 140344: Please show me how to find and graph the derivative value? Thanks! given: y = X^2 at X = 3 and at X = -1 Click here to see answer by Fombitz(13828)

 Question 140384: Solve 2x*squared* - 5x=5 by completing the square. Click here to see answer by ankor@dixie-net.com(15649)
 Question 140384: Solve 2x*squared* - 5x=5 by completing the square. Click here to see answer by stanbon(57307)

 Question 140475: for the derivative value I need to show tongant line in graph? Thanks Given y=X^2 at x = -2 So far I have At X=-2, the derivative is 2(-2)= 0 (please show graph). Click here to see answer by stanbon(57307)

 Question 140507: The area of a rectangle is the product of its length and width, and equals 1062. If the length is 5 more than three times the width, find the width of the rectangles. Please help me thank you. Click here to see answer by scott8148(6628)

 Question 140500: can someone please show ma how to do this .thanks in advance for your help.find the roots of each quadratic equation by factoring. 1. x^2-6xi got 2,4 2.x^2-9/4x-25 i got 4x3-100x-9/4x Click here to see answer by stanbon(57307)

 Question 140561: Solve by the elimination method. 3x + 4y = 3 6x + 8y = 6 Can someone please help me with this. I was doing really well with my work but now am stuck again. Help me please. Click here to see answer by checkley77(12569)