X=one type that cost 9
y=one type that cost 8
total books=type1+type2
total books=13
x+y=13
the total cost=cost of each added together
cost of each=number of books times cost per book
total cost=108
9x+8y=108
we have
x+y=13
9x+8y=108
solve for x and y
multiply first equation by -8 and add to first equation
-8x-8y=-104
<u>9x+8y=108 +</u>
x+0y=4
x=4
subsitute
x+y=13
4+y=13
minus 4
y=9
4 of the $9
9 of the $8
thats how to solve
Answer:
17x^2 -22x -2
Step-by-step explanation:
- 5x^2 +6x -2 +4x (3x-7)
- 5x^2 +6x -2 +12x^2 -28x
- 17x^2 +6x -2 -28x
- Answer: 17x^2 -22x -2
Just so you know when I put (^) the number after it is a exponent.
Answer:
Step-by-step explanation:
when adding a negative plus a positive, count forward the amount you're adding from the negative number. Like -5+2, -5--> -4--> -3
25-3=22 dollars left
then divide the amount of money left by the amount of candy bars
22/13= about 0.13 cents
Answer:
Step-by-step explanation:
The circumference of a circle is also the perimeter of the circle. The formula for determining the perimeter of a circle is expressed as
Perimeter = 2πr
Where
r represents the radius of the circle.
π is a constant whose value is 3.14
Therefore,
Circumference = 2 × 3.14 × 4 =
25.1 feet rounded to the nearest 0.1
The formula for determining the area of a circle is expressed as
Area = πr²
Area = 3.14 × 4² = 50.2 square feet rounded to the nearest 0.1