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Yydubrovensky4 replied to the thread John and Peter each had some erasers. John gave away 40% of his; Peter gave away 1/7 of his..P * 7 = 13 * 7 P = 91 P - 13 = 91 - 13 P = 78 J / 6 = 78 / 6 J / 6 = 13 13 * 10 = 130 130 + 91 = 221
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Yydubrovensky4 replied to the thread Figure 1 is formed by a rectangular box measuring 38cm by 15cm and 2 identical white balls....I have tried to understand the problem, but I am getting stuck in the following areas: I am not sure how to calculate the distance...
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Dr.Peterson reacted to topsquark's post in the thread Return the sum of numbers depending on number count? with
Sad.
See here. -Dan -
Dr.Peterson reacted to Steven G's post in the thread Trick or Treat: What trick would you use in solving x^2 - x^3 = 12? with Like.
He grouped it as (x2-22) - (x3 + 23)-----so he factored using the sum of cubes and the difference of squares.
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Steven G replied to the thread There were 288 more red than blue cards. After John used 75% of the red cards and....Let r = # of red cards at the beginning. Let b = # of blue cards at the start. There were 288 more red than blue cards===>r-b = 288 or r... -
topsquark replied to the thread Return the sum of numbers depending on number count?.See here. -Dan -
Steven G reacted to topsquark's post in the thread Finding the equation of a plane ("A golf ball is hit from a tee towards a hole...") with Wow.
Whoops! Please disregard my post. I misread the question. -Dan
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Steven G replied to the thread Return the sum of numbers depending on number count?.Add S = n + (n-1) + (n-2) + ... + 3 + 2 + 1 to S = 1 + 2 +3 + ... + (n-2) + (n-1) + n. Then 2S equals?? So S equals?
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Steven G replied to the thread How many times have you seen this?.I've seen it so many times that sometimes I think that it must be true--NOT
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Steven G reacted to Harry_the_cat's post in the thread How many times have you seen this? with Like.
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Steven G replied to the thread Trick or Treat: What trick would you use in solving x^2 - x^3 = 12?.He grouped it as (x2-22) - (x3 + 23)-----so he factored using the sum of cubes and the difference of squares.
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Kkhansaheb replied to the thread Return the sum of numbers depending on number count?.Similarly - extending the idea of response #2, What happens if you add the sequences 1, 2, 3, 4, 5, 6 and 6, 5, 4, 3, 2, 1, term by...
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Kkhansaheb reacted to Dr.Peterson's post in the thread Return the sum of numbers depending on number count? with Like.
You mean a sequence of successive whole numbers. And you want the sum of the series consisting of those numbers. Try searching for...
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![Qwertyuiop[]](/forum/data/avatars/s/102/102062.jpg?1657717664)
Qwertyuiop[] reacted to pka's post in the thread Find modulus and Arg of the complex number 1 / (1 + i tan(theta)) with Like.
Some of this is a repeat, If z=a+b\bf{i} then \dfrac{1}{z}=\dfrac{\overline{~z~}}{|z|^2}=\dfrac{a-b\bf{i}}{a^2+b^2} and... -
BigBeachBanana replied to the thread I want to know the revenue for various revenue categories by giving in a total number of available labor hours.Before we can help you come up with an equation, we need to know how you think the hours should be allocated to each project.