7(3a + 12) = 168 ← ( divide both sides by 7 )
3a + 12 = 24 ← ( subtract 12 from both sides )
3a = 12 ← ( divide both sides by 3 )
a = 4
OR
distribute the parenthesis by 7
21a + 84 = 168 ← ( subtract 84 from both sides )
21a = 84 ← ( divide both sides by 21 )
a = 4
I think its C. 7x3 = 21. 7x18 = 126. 9x7 = 63
If you all that the answer its 210. If you estimate what that little part above the farthest to the right shape, I'd say its near 18 to 21. Then add 210 with either numbers 18 through 21, it would be close to 227 square meters.
Answer:
9900
Step-by-step explanation:
Round 900 down because 47 is closer to 900 than 1000.
If you change the fraction to decimals that will make it easier to compare
it would take about 6 weeks and you would both have $130
Step-by-step explanation:
it would take you 5 weeks to reach $130 and your sister 1 week to reach $130.
