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3 years ago

B - (- 7) =-1 what is b?

2 answers:

8 0

Negative times a negative makes a positive
so we can get
B + 7 = -1
then subtract 7 from both sides
B = -1 - 7 = -8

therefore B = -8

irina1246 [14]3 years ago

4 0

B-(-7)= -1

First negative multiply by negative is POSITIVE.

So: B+7= -1

Subtract 7 from both sides

B= -7-1

B= -8.

Answer: -8.

To Check Answer: Plug in the variable of B in the original equation.

So: -8-(-7)= -1

-8+7= -1

-1= -1

If the Solution works out the answer is right.

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What number is between 3.16 and 3.17?

VladimirAG [237]

There are multiple answers to this question
Answers: 3.161, 3.162, 3.163, 3.164, 3.165, 3.166, 3.167, 3.168, 3.169
(You can just pick one)

Reason: just look at the place numbers. The number has to be between 3.16 and 3.17. So go to the next place value which is the thousandths place. 3.161-3.169 all are between since they have a 6 in the hundredths place, but does not go over 1.17

4 0

3 years ago

Calculate two iterations of Newton's Method to approximate a zero of the function using the given initial guess. (Round your ans

VikaD [51]

Answer:

The two iterations of f(x) = 1.5598

Step-by-step explanation:

If we apply Newton's iterations method, we get a new guess of a zero of a function, f(x), xₙ₊₁, using a previous guess of, xₙ.

xₙ₊₁ = xₙ - f(xₙ) / f'(xₙ)

Given;

f(xₙ) = cos x, then f'(xₙ) = - sin x

cos x / - sin x = -cot x

substitute in "-cot x" into the equation

xₙ₊₁ = xₙ - (- cot x)

xₙ₊₁ = xₙ + cot x

x₁ = 0.7

first iteration

x₂ = 0.7 + cot (0.7)

x₂ = 0.7 + 1.18724

x₂ = 1.88724

second iteration

x₃ = 1.88724 + cot (1.88724)

x₃ = 1.88724 - 0.32744

x₃ = 1.5598

To four decimal places = 1.5598

4 0

2 years ago

Solve 4/9x+7=1/2.<br><br> Solve 1/8x−12=3/4.

Elenna [48]

$\# 1 \\\\ \frac{4}{9}x+7=\frac{1}{2} \\\\ \frac{4x}{9}=\frac{1}{2}-7^{(2} \\\\ \frac{4x}{9}=\frac{1-14}{2} \\\\ \frac{4x}{9}=-\frac{13}{2} \\\\ 4x=-\frac{9*13}{2} \\\\ x=-\frac{\frac{9*13}{2}}{4} \\\\ x=-\frac{117}{2}*\frac{1}{4} \\\\ \boxed{x=-\frac{117}{8}=-14\frac{5}{8}}$

$\#2 \\\\ \frac{1}{8}x-12=\frac{3}{4} \\\\ \frac{1}{8}x=\frac{3}{4}+12^{(4} \\\\ \frac{x}{8}=\frac{3+48}{4} \\\\ \frac{x}{8}=\frac{51}{4} \\\\ x=\frac{\not8*51}{\not4} \\\\ x=2*51 \\\\ \boxed{x=102}$

4 0

2 years ago

Read 2 more answers

Can someone please answer this please answer it correctly please show work please please please answer it correctly

Lesechka [4]

Answer:

1.) C. 2 Pages

2.) B. 76 mph

3.) C. 35 cents

4.)?

5.)?

6.)B

7.) B

Step-by-step explanation:

1. 2 1/2 = 5/2 1 1/4 = 5/4 5/4 * 4/5 = 1 so it is a unit with one

5/2 * 4/5 = 4/2 or 2 (You found unit by multiply what you did to the unit, because what you do to one side you do to the other)

2. 3 1/2 = 7/2 7/2 * 2/7 7/2 = 266 multiply for unit price, other wise you don't know what the true mph is, now multiply the 266 by 2/7 because what you do to one side you do to the other

2/7 = 266/1 multiply numerators and denominators

2 * 266 = 532

7 * 1 = 7 now put it back as a fraction

532/ 7 simplify

532/7 = 76

76 mph

3. 1.75 = 1 3/4 = 7/4 7/4 = 5 price = bagels now multiply the 5 by 1/5 (reciprocal) so that you can figure out what the unit is

5 * 1/5 = 1

7/4 * 1/5 multiply numerators together and denominators together

7 * 1 = 7

4 * 5 = 20

7/20 = .35

35 cents

4. 5. I am not sure

6. Solve each of them

A. 12 6/10 =126/10 126/10 = 7 multiply both for 1/7 for unit price

7 * 1/7 = 1 126/10 * 1/7 multiply 126 * 1 = 126 10 * 7 = 70

126/70 = 1.80

B. 10.98 = 1098/100 1098/100 = 6/1

1098/100 * 6/1 Multiply so that the unit is right

1098/600 = 1.83

1.83 = 1 juice

C. 18.10 = 18 1/10 = 181/10 181/10 = 10 price = number of juice

181/10 * 1/10 = 181/100 multiply with 1/10 so that 10 is 1 (unit price)

$1.81 = 1 juice

D. 16 38/100 = 1638/100 1638100 = 9 multiply both sides by 1/9 so unit is 1

9 * 1/9 = 1

1638/ 100 * 1/9 1638/900 = 1.82

$1.82 = 1 juice

1.80 per juice is cheapest so it is B

B. 1 = $5 it is the unit so if you multiply by all the numbers on top it will equal the number in the row, none of the others do that

7 0

2 years ago

Read 2 more answers

I really need help with 23 through 30

BartSMP [9]

23. 120

24. 62

25. 84

26. 64

27. 121

28. 112

29. 65

30. 78

Brainiest answer please

4 0

3 years ago