Crystal quiz

Find the coefficient of xy in the expansion of (3x+2y)(5x-3y)

• -9

• -6

• 1

• 10

• 15

Express 0.3125 as a percentage

• 0.3125%

• 3.125%

• 31.25%

• 312.5%

• 3125%

Solve the equation; 12/x-2=3

• -3

• 3

• 2

• -2

• 4

Emily adds 5 to a certain number and the result is 20. Find the number.

• 5

• 10

• 15

• 20

• 24

Expand (2x+1)(x-2).

• 2x²-3x-2

• 2x²-3x+2

• 2x²+3x+2

• 2x³+3x-2

• 2x²-5x-2

P = 2/3t-1+1/3t-2, when t = 1

• 5

• 4

• 3

• 2

• 1

Solve for y, 2y/7+5=9

• 1

• 6

• 10

• 14

• 18

Calculate the area of a circle 🔴 with diameter 28cm (take π = 22/7).

• 165cm²

• 1,232cm²

• 616cm²

• 44cm²

• 88cm²

Find the value of x, if 2(x-2) = 12.

• 2

• 4

• 5

• 6

• 8

If Mitchell divides 3 by the sum of 2 and a certain number, the result is 6. What is the number?

• -2

• 16

• 20

• 4

• -5