Which of the following is not acceptable form of proof

Carlos has a box of coins that he uses when playing poker with friends the box contains 24 coins of pennies dimes and quarters the number of pennies is equal to the number of dimes and the total value is 1.

What do - 2 = 9 (4) equal to

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. The population of her town is changing by a constant rate. True or False?

A leather ball has a diameter of 28.4 cm. Which is the area of the piece of leather used on the surface of the ball?

Harriet earns the same amount of money each day. Her gross pay at the end of 7 workdays is 35h+56 dollars. Which expression represents her gross pay each day? 5h+8 8h+5 7h+11.2 11.2h+7

5y - 3z + 4y - 1z - 3y; y = 3 and z = - 2

An architect represents a 9 inch height as inch on a scale drawing. Which of the following scales did the architect use? 1 foot = inch 1 foot = inch 1 foot = inch 1 foot = inch

86% of senators support a bill. What fraction of senators support the bill?

Lettuce is packaged in four bags to a box. if there are 3.5 boxes of lettuce in a cooler, how many bags of lettuce would there be?

Christy drove 300 miles on her vacation. she drove an average of 1.25 times faster on the secont 150 miles of the trip than she did on the first 150 miles. what expression represents the time she spent driving? let x=her speed on the first half