Which choices are equivalent to the expression below?
2^7.19

C

Step-by-step explanation: Since 2^7.19 is 146.01, if you expanded it, it would be 2^7 * 2^1/10 * 2^9/100 which is also 146.01. It's also all about elimination. It can't be A be the 9 in 7.19 wouldn't be 9/10, it would be 9/100. It can't be B because 19/10 is 1.9 which is too much. It also can't be D because it's being added instead of multiplied.

i'm sure goog can you get that answer

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15