Answer: 162.6cm
Step-by-step explanation:
4 boys have a mean height of 162cm. Their total height will be the average multiplied by the number of boys which will be:
= 162 × 4
= 648cm
A new boy with height of 165cm joined. This means that we now have 5 boys and their total height will be:
= 648cm + 165cm
= 813cm
The new mean height will be:
= Total height / Number of boys
= 813 / 5
= 162.6cm
Answer:
b= -1/5
Step-by-step explanation:
Though a variable's sign changes when it is multiplied by -1, its absolute value does not. Therefore, we can eliminate the 1:
1/5+b=0
b+1-1/5=0-1/5
b+0/5= 0 -1/5
b=0 -1/5
and you have b= -1/5 as your answer
A polynomial is a perfect square trinomial if in form
a^2x^2-2ab+b^2
look at each
we can eliminate A and B since we have -b^2 not +b^2
look at the rest
C. 5^2b-3*5*b+3^2
nope
D. 4^2x^2-2*4*3x+3^3
yes
answe is D (factors to (4x-9)^2)
Well if you have four rows, then you could put them in four groups of twelve. 12 times 4 is 48, meaning you would have two left over.
Answer:
Step-by-step explanation:
