Question

1. Find the VALUE of 7x + 3y, when x = 12 and y = -6.

2. Write 0.0000387 in STANDARD FORM.


3. Calculate the AREA of a CIRCLE with radius 5.1 cm. ( Correct to 2 decimal places)


4. EXPAND and SIMPLIFY: 6(2y - 3) - 5(y + 1)

Answer 1

Answer:
1. 66
2. 3.87 x 10^-5
3. 81.67
4. 7y - 19

Step-by-step explanation:

7(12) + 3(-6)
= 84 - 18
= 66

2. 0.0000387 = 3.87 x 10^-5

3.
Area = 3.14 x (5.1)^2
= 81.67cm^2

4.
6(2y - 3) - 5(y + 1)
= 12y - 18 - 5y - 1
= 7y - 19

Answer 2

1.7(12) + 3(-6) = 84 - 18 = 66