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4 years ago

Which expression is equivalent?

Mathematics

2 answers:

Vedmedyk [2.9K]4 years ago

5 0

It’s answer D because when you slave it you will get -8x+19

Rashid [163]4 years ago

4 0

Answer:

Step-by-step explanation:

First, we expand the expression using the rule:

$x(y - z) = xy - xz$

$7 - (4 \times 2x)- ( - 4 \times 3)$

Double negative = Positive

$7 - (4 \times 2x) + (4 \times 3)$

$7 - 8x + 12$

$- 8x + 19$

The answer is D.

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Find slope of given two points <br> (-14,3) (7,-9)

Vesna [10]

Answer:

5/4

Step-by-step explanation:

(y2 - y1) / (x2 - x1)

(-9 + 14) / (7 - 3)

5/4

6 0

3 years ago

Solve the triangle. Round side measure to the nearest tenth and angle measures to the nearest degree.

shutvik [7]

First calculate the missing angle $\alpha$ . By knowing all angles in triangle have a sum of 180°.

$\alpha=180-(\gamma+\beta)$
$\alpha=180-(90+49)=\boxed{41}$

Now we required to use angle functions in a right triangle. The cosine of $\beta$ is equal to the relation of side $a$ and hypotenuse $c$ .

Now we solve this for hypotenuse.

$\cos(\beta)=\frac{a}{c}$

$c=\frac{a}{\cos(\beta)}$

Now put in the numbers.

$c=\frac{9}{\cos(49)}\approx\boxed{13.7}$

So we know the length of hypotenuse and length of side $a$ therefore side $b$ can be calculated using Pythagorean theorem: $c^2=a^2+b^2$ .

Solve for side $b$ .

$c^2=a^2+b^2$

$b=\sqrt{c^2-a^2}$

$b=\sqrt{13.7^2-9^2}\approx\boxed{9.7}$

So there you go. If you have any questions feel free to ask.

r3t40

6 0

4 years ago

Solving Equations with the Variable on Each Side · Practice

JulijaS [17]

Hello friend , I hope it's helps you

enjoy your day