Answer:
3(n-5)=2n+16
Step-by-step explanation:
3 lots of 'n' <em>and </em>5 means 3 times both values so these values are put into a bracket with a common multiplier (ie. the 3)
3(5 - n)
16 more than 2 lots of 'n' means that n has to be doubled. n + n = 2n. add 16 to this and we have
2n + 16
if these values are both equal (hence why they are in an equation) then all that is needed is for them to be set equal alongside each other.
3(n-5) = 2n+16
:)
B
Because 2 sqrt5 is = to sqrt 20.
4^2=16, 6^2=36
Answer:
Total area to be painted in gold = 24000 cm²
Step-by-step explanation:
Total height of the stairs = 120 cm
Total standing stairs = 4
Therefore, height or width of one standing stair as shown in the picture,
= 
= 30 cm
Length of every stair has = 100 cm
Every horizontal and vertical stair has the same area.
Area of one stair = Length × Width
= 100 × 30
= 3000 cm square
There are 4 horizontal and 4 vertical similar stairs to be painted in gold.
Total area to be painted in gold = 8 × Area of one stair
= 8 × (3000)
= 24000 cm²
Total area to be painted in gold = 24000 cm²
Add 21 to both sides, then that means you get
K>22
there is no need to change the signs, as you are not multiplying by a negative or anything
Step-by-step explanation:
2x+3y=23 2x+3.7=23 2×1 + 3×7 = 23
3y= 23 2×+21= 23 2 + 21 = 23
23÷3 = 7 2x= 23-21
y=7 2x= 2
x= 1
5x+3y=17 5×4+3y=17
5x=17+3 20+3y=17
5×=20 20=17+3y
14÷5 = 4 20=20+y
x=4 y=20-20
y=0
