4. A ramp makes an angle of 9° with the ground. What is the measure of the missing angle in the ramp?

81

Step-by-step explanation:

Assuming the ramp is against a wall or building at a 90 degree angle, then the 3 angles formed by the triangle within the ramp and wall are 9 +90 + x = 180 so 99 + x = 180 so x=81

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.