How do I solve this linear equation?

21+x=30

Find the value of (10 1/5) (-5)

Six times a number + 4 is the same as the number - 11

What is the possible outcomes of ordering chocolate, strawberry, and vanilla with sprinkles, marshmallows, and peanuts?

If you quadruple the input of a function in the resulting output is one fourth of the original output what may be true of the function check all that apply

4 feet 4 feet 3 feet 13 feet How is the base of the cylinder related to the base of the cone?

it takes the earth 24 hours to complete a full rotation. It take the sun approximately 25 days, nine hours, and seven minutes to complete a full rotation. How many hours does it take the sun to complete a full rotation?

you need 418 yards of blue silk to make one bridesmaid's dress and 358 yards of the same fabric to make another. How many yards of blue silk do you need to make both dresses?

What is the answer to x/3-9=-5

One of the highest snowfall rates ever recorded was in silver lake, colorado, in april 1921, when just over 7 feet of snow fell in 27.5 hours. what was the rate in inches per hour

On a sunny day an office building casts a shadow that is 80 feet long. At the same time, a 5 foot person casts a 6 foot shadow. Determine the height of the office building to the nearest foot.