Verify as an identity: cos (90°+x) = - sinx

I'm not sure how to go about this question

To qualify for a race, a runner must be able to run at a pace of at least 15 kilometers per hour. Noah ran 5 miles in 30 minutes. Does he qualify for the race? Explain your answer. (Note: There are approximately 1.6 kilometers in a mile.)

A 26-foot long ladder is leaning against a building at a 60° angle with the ground. Which of the following equations can you use to find the height of the building, h?

The school student council sponsor a switch day where students were able to switch classes every 20 minutes the students are in school for seven hours if a student switches as often as possible how many classrooms in all did that student visit

Determine the multiplicity of the roots of the function k (x) = x (x+2) cubed (x+4) squared (x-5) cubed

What is the y-intercept of the function f (x) = 4 - 5x? O-5 O 4 0 4 O 5

A glass of lemonade took 3 5/9 scoops of sugar if you wanted to make three glasses how many scoops of sugar would you need

49 = 72 in logarithmic form

Paul made a square patio that is 30 feet wide. What is the area of the patio?

Emily convinced her mom to buy a giant box of her favorite cereal. Her mom doesn't think the box will fit on their shelf. The volume of the box is 10000 cm

Is 3/5 greater than or less than 3/3