10. Five times a number decreased by 7 times the same number is at most 20. What is the number?
how do I write it and what is the answer?
3. The sum of a number and 7 is less than 19. What is the number?
9. Your test scores are 75, 93, 90, 82 and 85. What is the lowest score you can obtain on the next test to achieve an average of at least 86?
2007-01-27 11:24:01 · 10 answers · asked by Anonymous in Entertainment & Music ➔ Polls & Surveys
ASK THIS IN MATH CLASS OR IN THE MATH ANSWERS SECTION !!!!
2007-01-27 11:27:11 · answer #1 · answered by Anonymous · 3⤊ 1⤋
The answer is 91.
75+ 93+ 90 + 82 + 85 + 91= 516
516 divided by 6 is exactly 86.
For the second one, the number can be zero-eleven because 19-7 is twelve, and since it has to be LESS than 19 and not equal to it, it can be eleven or lower.
2007-01-27 11:30:58 · answer #2 · answered by Green-Eyed Gal 7 · 0⤊ 0⤋
5x-7x is less than or equal to 20...
-2x is less than or equal to 20...
x is greater than or equal to -10...
5(-10) - 7(-10) is less than or equal to 20...
-50 + 70 is less than or equal to 20...
20 is less than or equal to 20...
-10 is the number...
x + 7 is less than 19...
x is less than 19-7...
x is less than 12...
x is every number that is less than 12...
x + 75 + 93 + 90 + 82 + 85 all divided by 6 is equal to 86...
x + 425/6 = 86...
((x + 425)/6)(6) = 86(6)...
x + 425 = 516...
x = 516 - 425...
x = 91...
2007-01-27 11:38:22 · answer #3 · answered by elchavoguapo 6 · 1⤊ 0⤋
i don't get the first 2
i think the last one is 91
86= 75+93+90+82+85+n
________________________
6
86*6= 516- 425= 91
i got 425 by adding the scores
2007-01-27 11:30:43 · answer #4 · answered by Zack 3 · 0⤊ 0⤋
the component to observe about this one is that both words are perfect cubes: 8x^3 + 125y^3 = (2x)^3 + (5y)^3 So, we've a sum of cubes, which could continually be factored through the formulation: a^3 + b^3 = (a + b)(a^2 – ab + b^2) In our celebration: (2x)^3 + (5y)^3 = (2x + 5y)(4x^2 -10xy +25y^2)
2016-10-16 04:53:00 · answer #5 · answered by ? 4 · 0⤊ 0⤋
ok for the number 9, its really easy.
87
2007-01-27 11:28:15 · answer #6 · answered by klg1327 2 · 0⤊ 0⤋
Try the math or homework section sweetheart.
Most of us on here are to lazy to figure it out... :P
Good luck!
2007-01-27 11:28:38 · answer #7 · answered by Anonymous · 0⤊ 0⤋
I totally agree
2007-01-27 11:28:38 · answer #8 · answered by satinne_hui 2 · 0⤊ 0⤋
The smart people are in riddles and word-games .. these are the funny people.. Aren't you lucky?
2007-01-27 11:27:52 · answer #9 · answered by Anonymous · 3⤊ 1⤋
me either.. so good luck.
2007-01-27 11:27:46 · answer #10 · answered by brock 7 · 0⤊ 0⤋