A. 7
B. 5
C. 35
D. 245
2007-09-27 17:18:10 · 5 answers · asked by firefly_eyes75 3 in Education & Reference ➔ Homework Help
245. To get rid of the 75, you have to do it's opposite, so you multiply it by 75 b/c (1/75)x75= 1. and what you do to one side of the equation you have to do to the other side, and so you multiply 7 by 35, which equals 245
2007-09-27 17:27:29 · answer #1 · answered by Anonymous · 2⤊ 1⤋
the answer is D. 245, arrived at by multiplying both sides of the equation by 35. Thus you get X by itself on one side and 7 times 35 on the other. Multiply it out and check the answer. Is 245 divided by 35=7?
Yes, so it is correct answer.
2007-09-27 17:25:14 · answer #2 · answered by Mike 7 · 2⤊ 0⤋
D.245
2007-09-27 17:22:28 · answer #3 · answered by Bernardo 1 · 1⤊ 0⤋
it is D because you have to multiply 35 by both sides. cancel the 35 with the 35 on the left to leave only x, and multiple 7 by 35 which equals 245.
2007-09-27 17:24:37 · answer #4 · answered by jabs0125 2 · 1⤊ 0⤋
a) 5^x = 7 can be solved using logarithms Log (5^x) = Log (7) x Log (5) = Log (7) : x = Log (7)/Log (5) = 0.8451/0.6990 Then x = 1.21 (3sf) b) The equation 5^2x - 12.(5^x) + 35 = 0 can be written (5^x)² - 12(5^x) + 35 = 0 This can be factored (5^x - 7)(5^x - 5) = 0 Therefore either 5^x - 7 = 0, then 5^x = 7......and from above this gives x = 1.21 Or 5^x - 5 = 0, then 5^x = 5 and the only solution is when x = 1.
2016-03-16 21:16:39 · answer #5 · answered by ? 4 · 0⤊ 0⤋
D
The problem is the same if you write it out as 7 x 35 = x
2007-09-27 17:23:40 · answer #6 · answered by Anonymous · 1⤊ 0⤋
For the best answers, search on this site https://shorturl.im/kKQl9
You probably should do this your self but a. well 5^x=7 log 5^x = log 7 x log 5 = log 7 x = log7 / log 5 (use base 10 on the calculator, though it doesn't matter as you'll get the same answer as long as the base is the same in both logs). x = 1.21 b. well do a similar thing. You do 2x log 5 - 12x log 5 + log 35 =0 2x-12x = log 35/log 5 -10 x = log 35/log 5 x = - (log 35/ log 5)/10 Again use base 10. x = - 0.221
2016-03-27 00:11:42 · answer #7 · answered by ? 4 · 0⤊ 0⤋
x/35 = 7
x = 7.35 = 245
D
2007-09-27 17:25:38 · answer #8 · answered by Beardo 7 · 1⤊ 0⤋
245
2007-09-27 17:27:24 · answer #9 · answered by motorheadJJ 2 · 1⤊ 0⤋
D. 245 you have to mutiply both sides by 35 to isolate x.
2007-09-27 20:38:49 · answer #10 · answered by ? 2 · 1⤊ 0⤋