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12r

if v=

(r+r)

make r the subject of the equation .

& btw the 12r should be over the line more to look like a fraction .

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

its 4 because 2 times 2 is 4, if you double the number two you get four