Answer:
A,C and D
Step-by-step explanation:
A: 3x2=6
3x4X=12X
<em>6+12X</em>
C: 5x1=5
5x2X=10X
5+10X+1+2X
<em>6+12X</em>
D: 7x1=7
7x2X=14X
7+14X-2X-1
6+14X-2X
<em>6+12X</em>
X=number of boys.
y=number of girls.
we suggest this system of equation
x/y=9/7
x=y+116
We solve this system of equation by substitution method.
(y+116)/y=9/7
7(y+116)=9y
7y+812=9y
9y-7y=812
2y=812
y=812/2=406
x=y+116
x=406+116=522
answer: At the school there are 522 boys and 406 girls.
to chek.
522/406=1.2857...
9/7=1.2857...
The number of boys (522) is equal to 406+116=522.
Answer:
4.
Step-by-step explanation:
[(21 + 6) − 3^2] ÷ 9 ⋅ 2.
First work out the parentheses:
= ( 27 - 3^2) / 9 . 2.
Now the exponential:
= (27 - 9) / 9 . 2
= 18/9 .2
= 2 . 2
= 4.
Answer:
m=12
Explanation:
Given any quadratic function, y=ax²+bx+c.
We can determine the nature of the roots of such quadratic function by examining the discriminant, D where:
• If D>0, the roots are real and unequal.
,
• If D=0, the roots are real and equal.
,
• If D<0, the roots are complex.
In our given equation:
For the function to have exactly one zero, the value of D=0.
The value of m for which the function will have one zero is 12.
