How to find angles in a triangle

Devaughn is 9 years younger than Sydney. The sum of their ages is 61. What is Sydney's age?

What is the next number 2 7 8 3 12 9

Alexandra has a discount card that reduces the price of her grocery bill in a certain grocery store by 5% if c represents the cost of alexandra grocery bill

How many 5-digit numbers less than 60000 can be formed by writing the digits 0,3,5,6 and 7 in different orders?

What is greater5 3/4 or 5 3/8

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.