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damaskus [11]
1 year ago
8

Marisa can read 18 pages in 20 minutes. At that rate, how many hours will it take her to read an 837-page book?

Mathematics
1 answer:
lilavasa [31]1 year ago
5 0
Use directly proportional.
y=kx
20=18k
k=18/20
k=0.9

y=0.9 x 837
y=753.3

753.3 is minutes so change to hours is
753/60=12.55
12.55+0.30=12.85
12.85=13.25hours

Answer: 13.25hours
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,,,,,??,??,,,,,,,,,,,,,,,,
Andre45 [30]

Answer:

  the one real zero is in the interval (-1, 0)

Step-by-step explanation:

Descartes' rule of signs tells you there are 0 or 2 positive real zeros. Changing the signs of the odd-degree terms and applying that rule again tells you there is one negative real zero. At the same time, those coefficients (-3, -5, -5, +7) have a negative sum, so you know ...

  f(-1) = -6

  f(0) = +7

so there is a zero in the interval (-1, 0).

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You can try a few values between x=0 and x=10 to see what the function does in that part of the graph. You find ...

  f(1) = 10

  f(2) = 21

  f(3) = 58

So, it is safe to conclude that there are no real zeros for x > 0.

The only real zero of f(x) is in the interval (-1, 0).

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I like to use a graphing calculator for problems like this.

7 0
2 years ago
Find the values of each variables in each quadrilateral. ​
Ahat [919]
First lets solve for x we know 3x=90. In this case x=30. Now we can solve for y. We know the triangle needs to equal 180 so y+2(30)=180. So we get y=120. Hope it helps
7 0
3 years ago
Simplify the following expression. (19x + 4y) + (49x + 32y)
Valentin [98]

Answer:

68x + 36y

General Formulas and Concepts:

  • Order of Operations: BPEMDAS
  • Combining like terms

Step-by-step explanation:

<u>Step 1: Define expression</u>

(19x + 4y) + (49x + 32y)

<u>Step 2: Simplify expression</u>

  1. Combine like terms (x):                    68x + 4y + 32y
  2. Combine like terms (y):                    68x + 36y
4 0
3 years ago
Hey help me please (DON'T SUBMIT THAT ONE LINK THAT WILL HACK YOU! I WILL REPORT YOUR ACCOUNT​
nikitadnepr [17]

Answer:

368m

Step-by-step explanation:

16 x 20 = 320

8 x 12 x 1/2 = 48

Add them together and get 368

6 0
2 years ago
-3/7 × - 1 2/3<br>what is the answer ​
NNADVOKAT [17]

Answer:

\boxed{\frac{5}{7} }

Step-by-step explanation:

-\frac{3}{7} \times (- 1 \frac{2}{3} )

= -\frac{3}{7} \times (- \frac{5}{3} )

= \frac{5}{7}

7 0
2 years ago
Read 2 more answers
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