4- you can represent the siblings by
j+(1+2j)+(j-3)=26
Combine like terms
4J-2=26
4j=28
J=7
5- she paid 5.50 for 5 pounds (then got .50 off)
Step-by-step explanation:
2t + 8 <u>></u> - 4( t + 1)
2t + 8 <u>></u> - 4t - 4
2t + 4t <u><</u> - 4 +8
6t <u><</u> 4
Divide both sides by 6
T <u><</u> <u>4</u><u> </u>
6
t <u><</u> <u>2</u><u> </u>
3
I think that is the answer
Hope it helps :)
Please be careful about the sign
Discussion
1. Put brackets around the first two terms
y = (-x^2 + 6x) + 5
2. Take out the common factor of -1
y = -(x^2 - 6x) + 5
3. Inside the brackets, take 1/2 of - 6 and square it
y = -(x^2 - 6x + ( - 6 / 2)^2 ) + 5
y = -(x^2 - 6x + (- 3)^2 ) ) + 5
y = -(x^2 - 6x + 9 ) + 5
Note: Step 3 is very long. Make sure you work your way through it
4. You have added 9 inside the brackets. <em><u>It is actually - 9. So add 9 outside to balance the equation out. </u></em> This is the key step. Make sure you understand it.
y = - (x^2 - 6x + 9) + 5 + 9
5. Express the brackets as a square.
y = - (x + 3)^2 + 14
Discussion
The equation is now in vertex form. The minus tells you that the equation is a maximum. The maximum is located at ( - 3, 14 )
A graph follows to show the results.
The numerical value of the circumference is greater than the numerical value of the area.