(1). the temperature at noon is 3°C and then drops by 4°C . what is the new temperature? (2). the air temperature at 1pm was 3°C, At 6pm it was 5°C lower. the temperature at 6pm was?

(3). an athlete breaks a world record by 3/100 of a second. the old record was 9.62 seconds. what is the athlete new personal best time?

(4). Tara has £42.76 in her bank account. she pays in a cheque for £52.60 and writes cheques for £4.26, £3.59, and £27.80. the amount of money left in her account is how much??

(5). a skirt uses 1.8m length of material. how many skirts can be made from a roll of cloth 12.6m long??

(6). which number is halfway between 20.25 and 20.5??

(7). how many 0.5 litre cans of paint can be filled from a drum containing 30 litres??​

1 is -1°C

Step-by-step explanation:

drops means your subtracting, so 3-4 is -1.

six digits cordnate grids are gayyy

step-by-step explanation:

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12