Solve two sevenths plus seven fourteenths (2 points)
1 answer:
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1.) If the perimeters of the triangle and the rectangle are the same, then this means
First distribute:
2(3x - 3) = 6x - 6
2(x - 3) = 2x - 6
Let's look at the bolded coefficients:
6x - 6 + 2x - 6 = 4x - 2 + 2x
= 8x - 6 - 6 = 6x - 2
Isolate the variables:
8x - 6x = -12 - 2
2x = 10, so x = 5
Plug in the variables:
Rectangle: 2(3(5) - 3) + 2(5 - 3)
= 2(15 - 6) + 2(2)
= 24 + 4 = 28 feet
Triangle: 2(2(5)-1) + 2(5)
= 2(9) + 10 = 18 + 10 = 28 feet
Claire purchased 28 feet of fencing.
2.) Celia: 1200 calories a day, increases by 100 each day, so 1200 + 100d.
Ryan: 3230 calories per day, decreases it by 190 each day, so 3230 - 190d.
For the variables to equal the same amount:
Let's isolate the variables:
1200 - 3230 = -190d - 100d, since there is no such thing as negative 290 days,
290d = 2030
d = , so d = seven days.
Plug in variable:
Celia: 1200 + 100(7) = 1900 calories
Ryan: 3230 - 190(7) = 1900 calories.
In seven days, they will both be consuming 1900 calories.
3.) 800 + 16h = 720 + 21h
Isolate the variable:
800 - 720 = -16h + 21h
80 = 5h, which means 16 hours.
4.) 2500 + 150m = 3000 + 125m
Isolate the variable:
3000 - 2500 = 150m - 125m
500 = 25m
is 20 months.
5.)
200 - 50 = 55m - 45m
150 = 10m
m = 15 months.
6.) 200 + 45(15) = 200 + 675 = $875
7.)
= 200 - 20 = 60m - 45m
180 = 15m
= 12, so it will take 12 months.
Answer:
3x - y +
Step-by-step explanation:
Hooboy okay here we go.
1.) Rewrite the equation in the classic division method
3x³ + 2x²y - xy²
2.) Divide using normal division rules, but it's super hard now 'cause there are letters involved. Basically, what can you multiply 3x³ by to get 9x⁴? 3x. So 3x is your first number. Then multiply everything else by 3x, and subtract
3x
3x³ + 2x²y - xy²
-(9x⁴ + 6x³y - 3x²y²)
= 0 - 3x³y - 2x²y² - 5x²y + xy³
Now lets do that again, see what happens. 3x³ times -y should get -3x³y
3x - y
3x³ + 2x²y - xy²
- (9x⁴ + 6x³y - 3x²y²)
= 0 - 3x³y - 2x²y² - 5x²y + xy³
- ( - 3x³y - 2x²y² + xy³)
= 0 + 0 - 5x²y + 0
So! From this information, we can know that the answer is 3x-y with a remainder of - 5x²y. How it's written is shown above, in "Answer"