Math gather

Use matrices to solve the equations:

2x − 5y = 31

-3x + 7y = -45

• x = 8

  y = -3

• x = 1

  y = -6

• x = 3

  y = -5

• x = 13

  y = -1

Use matrices to solve the equations :

x + y - z = -3

2x - 3y + 4z = 23

-3x + y - 2z = -15

• x = 2

  y = -1

  z = 4

• x = -2

  y = -1

  z = 0

• x = 2

  y = -9

  z = -4

• x = 1

  y = -2

  z = 2

Claire and Dale shopped at the same store.

Claire bought 5 kg of apples and 2 kg of bananas and paid altogether $22

Dale bought 4 kg of apples and 6 kg of bananas and paid altogether $33

Use matrices to find the cost of 1 kg of bananas

• $4.50

• $4

• $3.50

• $3

What would the OUTPUT(x) be in the following scenario:

A = 1

B = 0

C= 0

• 1

• 0

What is the OUTPUT in the logic diagram?

• 1

• 0

Which logic gate is represented by the following symbol, ¬ ?

• NAND

• NOT

• NOR

In how many ways can the letters of the word 'LEADER' be arranged?

• 72

• 144

• 360

• 720

How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digits is repeated?

• 5

• 10

• 15

• 20

In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?

• 45

• 63

• 90

• 126

• 145

The first term in an arithmetic series is 3, and the 9th term is 35.  What is the 17th term?

• 51

• 54

• 67

• 68

• 71