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3 years ago

How do i simplify -3x-15?

Mathematics

2 answers:

galina1969 [7]3 years ago

8 0

Answer:

$45$

Step-by-step explanation:

$-3 \times -15$

Cancel the negative signs on both sides.

$3 \times 15$

Evaluate.

$=45$

Sindrei [870]3 years ago

3 0

Answer: -x-5

Step-by-step explanation:

-3x-15 . Both 3 and 15 are variables of 3, this means they can both be divided by 3. -3/3= -1 and -15/3=-5. So -1x-5, or -x-5

Hope this helped! :)

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During one month, a rental agency rented a total of 155 cars, trucks, and vans. Nine times as many cars were rented as vans, and

solong [7]

Answer:

The system of three equations is equal to

$x+y+z=155$

$y=9x$

$z=3y$

Step-by-step explanation:

Let

x ----> the number of cars rented during one month

y ----> the number of vans rented during one month

z ----> the number of trucks rented during one month

we know that

$x+y+z=155$ ----> equation A

$y=9x$ ---> equation B

$z=3y$ ----> equation C

8 0

3 years ago

What is 12.5% of 88?

fomenos

The answer is eleven (11)

6 0

3 years ago

Read 2 more answers

Help me find a ordered pair

Stels [109]

Answer:here are a few ordered pairs

1. (-9,0)

2. (0,3)

3. (3,4)

7 0

2 years ago

What is the height of the triangle? A) 17 units B) 34units C) 51units D) 68units <br><br> Help??

drek231 [11]

Answer:

51 units

Step-by-step explanation:

The ratio of the lengths of the sides of a 30-60-90 triangle is

short leg : long leg : hypotenuse = 1 : sqrt(3) : 2

The reason this is relevant here is that in your case, you start with an equilateral triangle, FGH. An equilateral triangle is also equiangular, so all angles are congruent and measure 60 deg.

m<F = m<FGH = m<H = 60 deg

When the height GR is drawn, <FGH is bisected creating two 30-60-90 degree triangles, FGR and HGR.

The altitude GR also bisects side HF, so

HR = FR = (1/2)HF = 17*sqrt(3)

In 30-60-90 degree triangle FRG, the short leg is FR; the long leg is GR; the hypotenuse is FG.

Now we use the ratio of the lengths of the sides of a 30-60-90 degree triangle.

short leg : long leg : hypotenuse = 1 : sqrt(3) : 2

We use only the short leg and long leg parts of the ratios.

17*sqrt(3) : GR = 1 : sqrt(3)

GR * 1 = 17 * sqrt(3) * sqrt(3)

GR = 17 * 3

GR = 51

8 0

3 years ago

Need help ASAP. The diagram shows 5ft student standing near a tree. The shadow of the student and the shadow of the tree at endp

inna [77]

Answer:

The height of the tree = 25 feet

Step-by-step explanation:

From the given diagram : EF = 5 feet, FA = 8 feet, CA = 40 feet

∠AFE = 90° and ∠ACB = 90°

To find : CB, the height of the tree.

Solution : In ΔAEF and ΔAB C

∠AFE = ∠ACB = 90°

∠A is common angle.

So, By AA postulate of similarity of triangle, ΔAEF ~ ΔABC

Now, sides of similar triangles are proportional to each other

$\implies\frac{FA}{CA}=\frac{EF}{CB}\\\\\implies \frac{8}{40}=\frac{5}{CB}\\\\\implies CB=\frac{40\times 5}{8}\\\\\implies CB=25$

Hence, The height of the tree = 25 feet

8 0

3 years ago