Class 10R sat a test the mean mark for the class was 70% there are 30 students in class 10R, 20 are boys the mean mark for the boys is 62% work out the mean for the girls

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

Identify the percent of change as an increase or a decrease. 75 people to 25 people response - correct increase decrease question 2 find the percent of change. round to the nearest tenth of a percent.