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4 years ago

1. 8 - n = -4

Mathematics

1 answer:

iogann1982 [59]4 years ago

4 0

Answer:

1.-n=-12; n=12

2.18=-2x; x=-9

3.-n=-12; n=12

4.b=3

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Write your numbet ad a mixed numbet in simplest form

Alex_Xolod [135]

Answer:

the answer is $2\frac{5}{12}$ hours

Step-by-step explanation:

so first we have to turn the fractions into mixed fractions, in order to do that we multiply the whole number by the denominator and add the numerator, our answer becomes the new numerator over the same denominator.

$3\frac{3}{4}$

3 x 4 + 3

12 + 3

$\frac{15}{4}$

we do the same thing again.

$1\frac{1}{3}$

1 x 3 + 1

3 + 1

$\frac{4}{3}$

then after we get our mixed fractions we subtract them from each other. Since the denominators are not the same we multiply to get the same denominators.

$\frac{15}{4}-\frac{4}{3}$

$\frac{15*3}{4*3}-\frac{4*4}{3*4}$

$\frac{45}{12}-\frac{16}{12}$

we subtract the numerators and keep the denominators.

$\frac{29}{12}$

then we simplify.

$2\frac{5}{12}$

6 0

3 years ago

Point A(3,8)

alexandr402 [8]

Answer:

$\displaystyle d = \sqrt{65}$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Coordinates (x, y)

Algebra II

Distance Formula: $\displaystyle d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$

Step-by-step explanation:

Step 1: Define

Identify

Point A(3, 8)

Point B(-1, 1)

Step 2: Find distance d

Substitute in points [Distance Formula]: $\displaystyle d = \sqrt{(-1 - 3)^2 + (1 - 8)^2}$
[√Radical] (Parenthesis) Subtract: $\displaystyle d = \sqrt{(-4)^2 + (-7)^2}$
[√Radical] Evaluate exponents: $\displaystyle d = \sqrt{16 + 49}$
[√Radical] Add: $\displaystyle d = \sqrt{65}$

5 0

3 years ago

I need help on number 16 these instructions say to solve these equations by cross multiplying

Grace [21]

Answer:

15. x = 4

16. a = 19

Step-by-step explanation:

"Cross multiply" essentially means "multiply both sides of the equation by the product of the denominators."

$\dfrac{x}{6}=\dfrac{2}{3}\\\\3(x)=6(2)\qquad\text{"cross multiply"}\\\\\boxed{x=4}\qquad\text{divide by 3}$

This is an example of a problem in which cross-multiplying introduces the need for an extra step: divide by 3. Had we simply multiplied by the denominator of the x-term, we would have been finished in one step:

x = 6(2/3) = 4

That is, rather than multiplying by the product of the denominators, sometimes the problem can be solved more easily if you multiply by their least common multiple.

$\dfrac{a+1}{a+5}=\dfrac{a-4}{a-1}\\\\(a-1)(a+1)=(a+5)(a-4)\qquad\text{"cross multiply"}\\\\a^2-1=a^2+a-20\qquad\text{simplify}\\\\\boxed{19=a}\qquad\text{add $20-a^2$}$

8 0

3 years ago

) A cyclist travels a distance of 90 miles in 5 hours. What was her average speed? 2) How far along a motorway would you travel

dimaraw [331]

The answer would be 649mph

7 0

3 years ago

zack bought a coat for $ 69.78 he paid with a $100 bill and received $26.73 in change. how much was the sales tax ?

Orlov [11]

$29.22 because $100-$70.78=$29.22
Hope I helped let me know.

7 0

4 years ago

Read 2 more answers