Which of the following are true statements about the expression -8 + 8?

3. List the coefficients in the expression below. 14x - 7x + 1-2x

elena-14-01-66 [18.8K]

Answer:

14, -7, -2

Step-by-step explanation:

The coefficient is the number that multiplies the variable, so list the numbers that fall under that definition:

14x - 7x + 1 - 2x

↑ ↑ ↑

14 -7 -2

The coefficients in the expression are 14, -7, and -2.

7 0

3 years ago

20. A cement mixer held 6 3/4 tons of cement. Ms. Folley used 2/3 of the cement for her driveway. How many tons of cement remain

NNADVOKAT [17]

Answer:

6 2/25 tons cement

Step-by-step explanation:

If cement mixer held 6 3/4 tons=6.75 tons

Mr. Folley used=0.67

After use cement are=6.75-0.67=6.08

So,

0.08=2/25

That's why answer is 6 2/25 tons

6 0

3 years ago

Given: cosθ= -4/5 , sin x = -12/13 , θ is in the third quadrant, and x is in the fourth quadrant; evaluate tan 1/2 θ

mrs_skeptik [129]

Answer:

Step-by-step explanation:

If you're looking for what the half angle of the tangent of theta is, I'm a bit confused as to why you think the angle in the 4th quadrant, x, is relevant. But maybe you don't know it isn't and it's a "trick" to throw you off. Hmm...

Anyways, the half angle identity for tangent is

$tan(\frac{\theta}{2})=\frac{sin\theta}{1+cos\theta}$

There are actually 3 identities for the tangent of a half angle, but this one works just as well as either of the others do, so I'm going with this one.

If theta is in QIII, the value of -4 goes along the x axis and the hypotenuse is 5. That makes the missing side, by Pythagorean's Theorem, -3. Filling in our formula:

$tan(\frac{\theta}{2})=\frac{-\frac{3}{5} }{1+(-\frac{4}{5}) }$ which simplifies a bit to