All categories

3 years ago

If Judy completes a puzzle by herself, it takes her 3 hours. working with sal, it only takes them 2 hours.

Mathematics

2 answers:

Kamila [148]3 years ago

8 0

Answer:

Step-by-step explanation:

timurjin [86]3 years ago

6 0

Answer:

C. $\frac{1}{3}$

Step-by-step explanation:

We have been given a table showing rates of time taken by Judy and Sam to complete a puzzle.

We can see from our given table that Sal's rate is r. We are told that Judy completes a puzzle by herself, it takes her 3 hours. working with Sal, it only takes them 2 hours.

Since Judy completes the puzzle in 3 hours, so part of puzzle completed by Judy in one hour would be $\frac{1}{3}$ , therefore, correct choice is option C.

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The sum of two numbers is 8 if one number is subtracted from the other the result is -4

Delvig [45]

A + b = 8
a - b = -4

a = b - 4
(b - 4) + b = 8
2b - 4 = 8
2b = 12
b = 6
a + 6 = 8
a = 2

a = 2
b = 6

2 + 6 = 8
2 - 6 = -4

3 0

3 years ago

Read 2 more answers

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Pavlova-9 [17]

Answer:

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Step-by-step explanation:

The output value means y and the input value means x.

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3 years ago

N=4; 2i and 3i are zeros <br> f(-1)=50

Nonamiya [84]

Solution:- $\text{Let f(x) be any nth degree polynomial with n=4}\\$

$\text{Given that 2i and 3i are the zeroes of f(x)}$

$\text{so (x-2i) and (x-3i) are factors of f(x)}$

$\text{Since 2i is a zero of f(x) then its conjugate -2i is also a zero of f(x)}$

$\Rightarrow(x+2i) \text{is a factor}\\\text{Similarly, conjugate of 3i is -3i is also a zero of f(x) }\\\Rightarrow(x+3i)\text{is a factor}\\\text{So , }\\f(x)=k(x-2i)(x+2i)(x-3i)(x+3i)\\=k(x^2-(2i)^2)(x^2-(3i)^2)\\=k(x^2-4i^2)(x^2-9i^2)\\=k(x^2+4)(x^2+9)\\=k(x^4+13x^2+36)\\\text{As given}\\f(-1)=50\\\Rightarrow k((-1)^4+13(-1)^2+36)=50\\\Rightarrow k(1+13+36)=50\\\Rightarrow k(50)=50\\\Rightarrow k=1\\\text{So by substituting k=1 in f(x) we get ,}\\f(x)=(x^4+13x^2+36)$

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3 years ago

Find the squares of (y+3)

emmasim [6.3K]

Answer:

Since we know that

(a+b)

+2ab+b

(a−b)

−2ab+b

Now,

(i)

(x+3y)

+2×x×3y+(3y)

+6xy+9y

(ii)

(2x−5y)

=(2x)

−2×2x×5y+(5y)

=4x

−20xy+25y

(iii)

(a+

)

+2×a×

)

+1+

(iv)

(2a−1a)=(1a)

(1a)

=1a

Answer

8 0

3 years ago

Based on the triangles, which statement is true?

AlladinOne [14]

The sum of interior angles of a triangle is 180°, and a linear pair is supplementary (adds to 180°). The appropriate choice is

... G. w = 105°, because ...

_____

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4 0

3 years ago