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48

Step-by-step explanation:

To find the perimeter double each side and add them together

2(3x+7) + 2(2x-3)

2(3(4) + 7) + 2( 2(4) - 3)    substitute 4 for x

2(12 + 7) + 2(8 - 3)             simply parenthesis (multiply)

2(19) + 2(5)                    simply parenthesis (add/subtract)

38 + 10                         distributive property

48                                 add

for any of you who need the translation here it is

step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i