Nicola wants to put a flat roof on a bike store, The roof will be
made of concrete
in the shape of a cuboid as shown.
Density
mass
volume
.
12 em
Nicola wants to put a metal strip along 2 of the longest edges of the roof.
She knows
the density of concrete is 2300 kg per mi
the mass of 1 metre of metal strip is 5kg,
.
(5)
Work out the total mass of the concrete and the strips she wants.

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -