Given the equation 3x + 7 = -4, which

Mathematics

1 answer:

Pavel [41]3 years ago

7 0

Answer:

Subtraction Property of Equality

Step-by-step explanation:

you should subtract both side with 7 first.

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I need help with this also I had was to repost it again because someone deleted it

igomit [66]

Answer: 8:05

Step-by-step explanation:

8 0

2 years ago

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What is the value of x when -3x + 7x = -12?

Natalka [10]

-3 + 7x = -12

First, simplify -3x + 7x to get 4x. / Your problem should look like: 4x = -12
Second, divide both sides by 4. / Your problem should look like: x = $- \frac{12}{4}$
Third, simplify $\frac{12}{4}$ to 3. / Your problem should look like: x = -3

Answer: x = -3

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3 years ago

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What is the area of triangle PQR? Round to the nearest tenth of a square unit.

larisa86 [58]

ANSWER

111.3 square units.

EXPLANATION

The formula for calculating the area of a triangle is.

$Area = \frac{1}{2} \times base \times height$
Let us the side of the triangle with side 12 units to be the base of the triangle.

Then the height of the triangle can be determined from the diagram using trigonometry.

$\sin(68 \degree) = \frac{height}{20 }$

$height = 20 \sin(68 \degree)$

$height = 18.54$

We now plug in the values in to the formula to obtain,

$Area = \frac{1}{2} \times 12 \times 18.54$

$Area = 111.3 \: square \: units$

See graph