9514 1404 393
Answer:
14
Step-by-step explanation:
The applicable rules of exponents are ...
(a^b)(a^c) = a^(b+c)
(a^b)^c = a^(bc)
__
(7^?)(7^5)^4 = 7^34
(7^?)(7^20) = 7^34 . . . . simplify power of power
7^(?+20) = 7^34 . . . . . . simplify product
? +20 = 34 . . . . . . . . . . equate exponents of the same base
? = 14
Answer:
C
Step-by-step explanation:
use calculator
press a b/c
Answer:
0,-14
Step-by-step explanation:
5(x+7)²=245
divide both sides by 5
(x+7)²=49
Taking the square root of both sides
x+7=±7
Either x+7=7
subtract 7 from both sides
x+7-7=7-7
x=0
or
x+7=-7
subtract 7 from both sides
x+7-7=-7-7
x=-14
1) C
2) I don't understand the question<span />