Whoever me is my saviour! i need this in by tomorrow!

1) 7/8 + 2/5 = ? (simplest form)
2) 2 1/3 * 1/4 = ? (simplest form)
3) divide £72 in the ratio 2: 3: 1
4) 39/65 people in a book club have blonde hair what percentage does not have blond hair?
5) 20% of 90 = ?
6) factorise: 2x^2 + 18x^3
7) expand: (y - 8)(y - 6)
8) factorise: x^2 + 4x + 3
9) evaluate: y^0
10) 0.0342 in standard form
11) if x = -4 and y = 3 find z, when z = 4x - y^3
12) 'x' the subject of: y + 2x = x - 2
13) solve: 8 - 7x = 22
14) find nth term of the following: 5, 10, 15,
15) estimate (63*128) / 32.9
16) 938 * 21 = ?

1) .

2)

hence, answer is 7/12.

3) We have to divide £72 in the ratio 2:3:1

the total of the ratio is=2+3+1=6

so on dividing 72 into 6 parts we have 72/6=12

First '2' parts=2×12=24

second '3' part=3×12=36

last '1' part=1×12=12

so dividing £72 in the ratio 2:3:1 is: £24,£36 and £12

4) 39 people out of 65 have blonde hair.

Number of people who do not have blonde hair=65-39=26

percentage people who do not have blonde hair is given by:

Hence, percentage people who do not have blonde hair is 40%

5) 20% of 90= (20/100)×90

                       =18

Hence, 20% of 90 is 18.

6) Factorise

7) Expand

8)

.

9)

10)

11) x= -4 y=3

and z=4 x-y^3

z=4×(-4)-3^3

z= -43

12)

13)

Hence x= -2

14) 5,10,15,20,....

Hence,  nth term is 5n.

15) (63×128)/32.9=245.106.

16) 938×21=19698.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

146

step-by-step explanation: