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Ilya [14]
3 years ago
15

4. Miguel is helping his mom paint his home. He finished 2 rooms in ⅓ of an hour. How many rooms can he paint in 1 hour?

Mathematics
1 answer:
lilavasa [31]3 years ago
8 0

Answer: 6

Step-by-step explanation:

Let's use a rule of three here.

2 rooms in 1/3 h

x rooms in 1 h

\frac{2}{x}=\frac{\frac{1}{3} }{1}

Solve for x;

x=\frac{2*1}{\frac{1}{3} }

Remember that when you divide by a fraction, you invert the fraction and multiply by the numerator.

1/3 inverted is 3/1 or 3

x=(2*1)*3

x=(2)*3\\x=6

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PLEASE HELP ASAP
maria [59]

Answer:

First option:  3x^2-5x=-8

Second option: 2x^2=6x-5

Fourth option: -x^2-10x=34

Step-by-step explanation:

Rewrite each equation in the form ax^2+bx+c=0 and then use the Discriminant formula for each equation. This is:

D=b^2-4ac

1) For 3x^2-5x=-8:

 3x^2-5x+8=0

Then:

D=(-5)^2-4(3)(8)=-71

Since D this equation has no real solutions, but has two complex solutions.

2) For 2x^2=6x-5:

 2x^2-6x+5=0

Then:

D=(-6)^2-4(2)(5)=-4

Since D this equation has no real solutions, but has two complex solutions.

3) For 12x=9x^2+4:

 9x^2-12x+4=0

Then:

D=(-12)^2-4(9)(4)=0

Since D=0 this equation has one real solution.

4) For -x^2-10x=34:

 -x^2-10x-34=0

Then:

D=(-10)^2-4(-1)(-34)=-36

Since D, this equation has no real solutions, but has two complex solutions.

3 0
3 years ago
Dominic considers buying 2 points on a 25-year, fixed rate mortgage for $187,600. His interest rate will be 5.45% if he does not
algol [13]

Answer:

If Dominic buys 2 points (2% of the loan value) he will get a better rate and hence less payment.  The question is asking how long will it take him to save the initial investment of 2% of the loan value due to a smaller payment.  The monthly payment at 5.45% is  $1,146.43,  the monthly payment for 5.2% is  $1,118.66.  This is a difference of  $27.77 per month.  The 2 points will cost him  $3,752.00.  The question is asking how long will it take Dominic to re-coup his  $3,752.00 if he saves $27.77 per month.  Just divide the 2 numbers and you get  135.10 months.  If you divide that by 12 you get 11.26 years, which is roughly 11 years, 4 months.

Step-by-step explanation:

Here is what the question is asking.  If Dominic buys 2 points (2% of the loan value) he will get a better rate and hence less payment.  The question is asking how long will it take him to save the initial investment of 2% of the loan value due to a smaller payment.  The monthly payment at 5.45% is  $1,146.43,  the monthly payment for 5.2% is  $1,118.66.  This is a difference of  $27.77 per month.  The 2 points will cost him  $3,752.00.  The question is asking how long will it take Dominic to re-coup his  $3,752.00 if he saves $27.77 per month.  Just divide the 2 numbers and you get  135.10 months.  If you divide that by 12 you get 11.26 years, which is roughly 11 years, 4 months.

3 0
3 years ago
Twice the difference of 3x and y increased by 5 times the sum of x and 2y
Phantasy [73]
The answer is 2(3x-y)+5(x+2y).
8 0
3 years ago
Help me please i jave 10 min left HELP​
yaroslaw [1]

Answer:

Option (A).

Step-by-step explanation:

8\frac{4}{5} is a mixed fraction and can be written as,

8\frac{4}{5}=8+\frac{4}{5} [Combination of a whole number and a fraction]

When we multiply this mixed fraction by 7,

7\times 8\frac{4}{5}=7\times (8+\frac{4}{5})

          =(7\times 8)+(7\times \frac{4}{5}) [Distributive property → a(b + c) = a×b + a×c]

          =56+\frac{28}{5}

          =56+5\frac{3}{5}

          =56+5+\frac{3}{5}

          =61+\frac{3}{5}

          =61\frac{3}{5}

Therefore, 7\times 8\frac{4}{5}=61\frac{3}{5} will be the answer.

Option (A) will be the correct option.

7 0
3 years ago
Lorea is designing the top of a quilt which measures 2,160 square inches. Triangles will cover 432 square inches of the quilt, a
timurjin [86]
2160 - 180 - 432 = 612
Each parallelogram is 3 square inches
divide by 3
612/3 = 264 parallelograms to complete the quilt.
7 0
3 years ago
Read 2 more answers
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