Penelope determined the solutions of the quadratic function by completing the square.

f (x) = 4x2 + 8x + 1

-1 = 4x2 + 8x

-1 = 4 (x2 + 2x)

-1 + 1 = 4 (x2 + 2x + 1)

0 = 4 (x + 2) 2

0 = (x + 2) 2

0 = x + 2

-2 = x

What error did Penelope make in her work?

The median to 4.7,8.51,6.5,7.42,9.64,7.2,9.3

Round 90608.5881594 to 1 decimal place

5 + (x-11) = 5x-14. What is x?

What is 2/9 divided by 3?

On my brother's 14th birthday, he was 160 cm tall. Within exactly one year, his height increased by 6%. How tall was he on his 15th birthday? Round your answer to the nearest cm.

A cylinder has a height of 23 m and a volume of 18,488 m³. What is the radius of the cylinder? Round your answer to the nearest whole number. 256 m 50 m 32 m 16 m

8x9-2-3 = 32 Where do the parentheses go

Mr. Yi buys vegetables at a market. He purchases 6 pounds of potatoes, p, and 3 pounds of onions, n, for $18. Onions cost twice as much as potatoes.

What is the square root of 256?

Mark and peter went to an arcade where the machines took tokens. Marilk played 9 games of ping pong and 5 games of pinball, using a total of 29 tokens. At the same time, peter played 3 games of ping pong and 1 game of pinball using up 7 tokens.