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Gekata [30.6K]
3 years ago
7

So far, Monica has read ã of a book. She

Mathematics
1 answer:
serg [7]3 years ago
5 0
How many pages are their?
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In a field there are cows, birds, and spiders. Spiders have 4 eyes and 8 legs each. In the field there are 20 eyes and 30 legs.
Kitty [74]

Answer:

1 spider, 3 cows, 5 birds.

Step-by-step explanation:

Cows (C): 4 legs, 2 eyes.

Birds (B): 2 legs, 2 eyes.

Spiders (S): 8 legs, 4 eyes.

The number of legs and eyes are given, respectively by:

30 = 4C+2B+8S\\20 = 2C+2B+4S

Multiplying the second equation by -2 and adding it to the first one gives us the number of birds:

30 -40= 4C-4C+2B-4B+8S-8S\\-10 = -2B\\B=5

Rewriting the original equations with B =5:

30 = 4C+2*5+8S\\20 = 2C+2*5+4S\\20 = 4C+8S\\10 = 2C+4S\\C=5-2S

Since the number of cows cannot be negative, and both C and S must be odd numbers, the only possible value of S is 1:

C=5-2S\\S=1\\C=3

7 0
3 years ago
Pls help is easyyyyy geometry
Makovka662 [10]

Answer:

A = 30 unit^2

Step-by-step explanation:

To find the area of the triangle

A = 1/2 b*h where b is the length of the base and h is the height

b = 12 and h =5

A = 1/2 (12*5)

A = 1/2 *60

A = 30 unit^2

8 0
3 years ago
Mrs eaves bought 5lb 15 oz of apples and 8lb 8oz of oranges. How many more ounces of oranges did she buy than apples!
PtichkaEL [24]
41 more ounce is the answer or 2.5625
4 0
3 years ago
The expression (8-3)^2-(5-2)^2 is equivalent to what numerical expression
Tresset [83]
(8-3)²-(5-2)²
Follow the PEMDAS
P-Parenthesis
E-Exponents
M/D-Multiplication/Division
A/S-Addition/Subtraction
clear the numerals in the parenthesis:
(5)²-(3)²
Now do the exponents:
=25-9
=16
Its just: (5)²-(3)²
7 0
3 years ago
What is the x intercept Y=-6x+8
forsale [732]
\large\begin{array}{l} \textsf{You can easily find x intercept of a line by solving}\\\textsf{the equation below:}\\\\ \mathsf{y=0}\\\\ \mathsf{-6x+8=0}\\\\ \mathsf{-6x=-8}\\\\ \mathsf{x=\dfrac{-8}{-6}}\\\\ \boxed{\begin{array}{c}\mathsf{x=\dfrac{4}{3}} \end{array}} \end{array}

4 0
3 years ago
Read 2 more answers
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