A group of students take a test. The group consists of 12 boys and 8 girls.

The mean mark for the boys is 18

The mean mark for the girls is 16.5

Calculate the mean mark for the whole group.

The sum of three and twelve times a number is 363. What is the number?

Factorise 2y^2 + y + 6xy + 9x - 3

Yasmin swims at a constant rate of 2 km/h for 2.5 h. How far does Yasmin swim? 4.5 km 5 km 6 km 6.5 km

jackson has six $20.00 bills. He is going to buy a pair of Nike Free Run shoes that cost $70.00 and two shirts. Write and inequality for this problem. If jackson spent all of his money on shoes and two shirts how much did he spend on his two shirts

When added to the number that is produced by doubling the number x the result is equal to 8 times the number that is 5 less than x what is the value of x?

What is the vertex of this quadratic function? h (x) = - 5 (x + 7) 2 + 11 A. (7,11) B. (7,-11) C. (-7,-11) D. (-7,11)

What is the unit rate of 14lb for $2.99

What is the value of x/4y, when x = 16 and y = 2? a. 1/32 b. 2 c. 2/2 3 d. 4

Diana has a diamond necklace shaped like a parallelogram. The area of the diamond is 3.6 cm2 and the base is 3 mm. What is the height of the necklace

If r = 300+y and b = 2*r, what is y