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Y=x^9-x^1/2, find d^2y/dx^2

Twice the sum of a number and 9 equals 7. Use the variable y for the unknown number.

Write 0.83 as a fraction. A) 1 5 B) 3 5 C) 5 11 D) 5 6

Find the area of a triangle with a base length of 3 units and a height of 4 units. 3 square units 6 square units 7 square units 8 square units Is it 6 square units? Tell me if i'm wrong.

Given the sets A = {-4, - 1, 3, 5, 9} and B = {-2, - 1, 0, 1, 2, 3}, the set AUB (u is upside down) is given by: {-4, - 2, - 1, 0, 1, 2, 3, 5, 9} {-4, - 2, - 1, - 1, 0, 1, 2, 3, 3} {-1, 3} 0

What is 32.60 rounded to the nearest tenth.

The perimiter of a rectangle is 46cm. The area is 90cm2. What are the lengths of the rectangles sides.

You live 3 1/2 miles from school. In the morning, you walk 1/4 mile directly toward school to take the bus. After school, you walk home the same distance when the bus drops you off. How many miles do you ride the bus to and from school each day?

The equation 8w+4 = 76 models how many weeks, w, it takes a student to save for a new video game. If the student saves the same amount of money each week, how many weeks does it take the student to save for the new video game?

The sum of two numbers is 50 and their difference is 4