2 years ago

How do you solve -(-7)

Mathematics

2 answers:

tresset_1 [31]2 years ago

7 0

The answer to -(-7) is 7

Hoochie [10]2 years ago

7 0

Answer:

it 7

Step-by-step explanation:

Multiply negative one by negative seven which is positive seven

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Please help?<br>:):):):)

Citrus2011 [14]

Answer:

6.48%

Step-by-step explanation:

t - c = b

t = 31.93

c = 29.99

b = 31.93 - 29.99

b = 6.48%

4 0

3 years ago

When deriving the quadratic formula by completing the square, what expression can be added to both sides of the

liubo4ka [24]

Answer:

The element you add is $b^2 / 4a$

Step-by-step explanation:

The element you add is $b^2 / 4a$

Remember that

$a x^2 + bx +c \\= a ( x^2 +(b/a)x ) + c$

So, in order to complete the square you add $(b/2a)^2$

But when you multiply times $a$ you get

$b^2 / 4a$

7 0

2 years ago

Read 2 more answers

If 30% of John's photographs were perfect, but 210 photographs were not perfect, then how many photographs were there in all?

anyanavicka [17]

If 30% were perfect, 70% were not perfect. So we know that 70% of the total number of photographs is 210.

p(70/100)=210 multiply both sides by 100

70p=21000 divide both sides by 70

p=300

So there are 300 photographs in all.

3 0

3 years ago

What is the greatest number of planes determined by four collinear points

Sidana [21]

The greatest number of planes determined by four collinear points is ∞ , infinity

5 0

2 years ago

Find the percent change from 48 to 228. Tell whether it is a percent increase or decrease. If necessary, round your answer to th

KIM [24]

228 - 48 = 180

180/48 = 3.75

Its increase 375%

7 0

2 years ago

How do you solve -(-7) ​

How do you solve -(-7)