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Natasha2012 [34]
3 years ago
9

The sum of a number and -7 is equal to 40. Write the equation

Mathematics
2 answers:
Luba_88 [7]3 years ago
6 0

Answer:

Step-by-step explanation:

-7 + 47=40

kupik [55]3 years ago
5 0

Answer:

-7 + n = 40

Step-by-step explanation:

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Dmitry [639]

The answer is x=150 degrees.

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Camila and Lucíana bought the same mobile phone but in different places. Camila's had a value of 120,000 but they gave her a 30%
vampirchik [111]

Answer:

Camila paid less

Step-by-step explanation:

In the question, we are told:

Camila's phone had a value of 120,000 but they gave her a 30% discount.

Therefore, Camila paid:

30% × 120,000

= 30/100 × 120,000

= 36,000

Luciana had a value of 150,000 on which they applied a 40% discount

Luciana paid:

40% × 150,000

40/100 × 150,000

= 60,000

From the calculation,

Camila paid 36,000 and Luciana paid 60,000, therefore, Camila paid less.

8 0
3 years ago
If A is a square matrix such that A^2=2I,then A^-1=?​
Afina-wow [57]

A^2=2I

Recall that I=AA^{-1}=A^{-1}A, so

A^2=2(A^{-1}A)

Multiply on the right by A^{-1} and regroup terms:

A^2A^{-1}=2(A^{-1}A)A^{-1}

A(AA^{-1})=2A^{-1}(AA^{-1})

A=2A^{-1}

and finally solve for A^{-1}:

\boxed{A^{-1}=\dfrac12A}

3 0
3 years ago
Find (8.4×108) ÷ (1.2×103). Express your answer in scientific notation.
kvv77 [185]

Answer: 7.33980582 x 10^0

Step-by-step explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10. The sign of the exponent will depend on the direction you are moving the decimal.

8 0
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tigry1 [53]

Answer:

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Step-by-step explanation:

<u>Expression</u>

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<u>And</u>

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<u>The amount is</u>

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7 0
3 years ago
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