What value for x makes the equation 11x – 10 = 4(x + 2) + 10 true?

a. 4 b. 3
c. -3 d. 6

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Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?

Me with these questions , i don’t understand scientific notation!