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4 years ago

Estimate plz: 137,638+52,091 Explain plz how to do it

2 answers:

8 0

You should round to the nearest thousand so it would be 138,000+52,000 because the six in 137,638 would round the thousands to seven and 52,091 would round to 52,000
because zero doesn't round up so then you add up 138,000+52,000 and you get your estimated answer.

IceJOKER [234]4 years ago

7 0

The best way to estimate it is to do "written addition" in your head, adding 1+8, then 9+3, all the way until you get to the front. the actual answer is 189,459, so your answer should be somewhere close to that.

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HELP me with all this ASAP urgent!!!!

artcher [175]

Answer:

9. A. (3,-2)

10. B. 43°

11. D. 343 cm²

12. A. 15

Step-by-step explanation:

9.Coordinates for summit/vertex U (2,3) after a rotation of 270 degrees.

Rotating a figure by 270 degrees is exactly like rotating it -90 degrees, crossing down over the X-axis (at least for the two summits that are in the first Quadrant).

Doing so, what we do is invert the coordinate numbers (so 2,3 become 3,2) and we change the sign of the Y-value, since we are now in the 4th quadrant, in a negative Y-value domain.

So, vertex U (2,3) becomes (2,-3) after a 270 degrees rotation.

10. Parallelogram JKLM. Determine angle L real value, using the expressions: ∠J =(6x + 7)° , ∠M =(y + 10)° and ∠L =(4x + 19)° ,

Since it's a parallelogram, we know that ∠J = ∠L, so we create an equation and solve it.

6x + 7 = 4x + 19

2x = 12

x = 6

Then we use that value inside the expression given for L:

∠L =(4x + 19)° = (4 (6) + 19)° = (24 + 19)° = 43°

Answer is 43°

11. 2 similar trapezoidal prisms, 5 and 7 of sides respectively. Surface area of the small one is 175 sq cm, what' the surface area of the larger one?

We know that the two prisms are similar.... so all respective sides will be in the same proportion. We know the scale factor is 1.4 (7/5).

So, to calculate the surface area of any side, we'll have something like that:

SA = 1.4x * 1.4y = 1.96xy (x and y representing the dimensions of the small prism)

So, the surface area of the large one is 1.96 times the one of the small one.

SA = 1.96 * 175 = 343

Answer is then D. 343 cm²

12. For the triangle shown, solve for x.

We know the angle facing the 25 units side is a right angle (90 degrees).

So, we can use the Law of Sines to solve this:

$\frac{c}{sin(C)} = \frac{a}{sin(A)}$

Let's assume c = x, what we're looking for. C is then 37 degrees. A = 90 degres and a = 25.

We isolate c and solve:

$c = \frac{a * sin(C)}{sin(A)} = \frac{25 * sin(37)}{sin(90)} = 15.05$

The length of x is 15.05 or 15, answer A.

4 0

3 years ago

The distance by road from town A to town B is 257 km. What is 50% of that distance?

Marina86 [1]

Answer: 128.5km

Step-by-step explanation:

Since we are given the information that the distance by road from town A to town B is 257 km. To get 50% of the distance, we simply have to multiply the distance given by 50%. This will be:

= 50% × 257km

= 50/100 × 257km

= 0.5 × 257km

= 128.5km

Therefore, 50% of the distance is 128.5km.

3 0

3 years ago

I need help please and explain your answer it’s number 4

Brums [2.3K]

Answer:

Step-by-step explanation:

Well "value" of 3x^2 - 7x + 9 when x = 4 is just x plugged into the expression

3 * 4^2 - 7 * 4 + 9

3 * 16 - 28 + 9

= 29

8 0

2 years ago

Which features describe the graph? Select all that apply

victus00 [196]

Answer:

- Decreasing

Step-by-step explanation:

im not sure of the last two but the others are for sure a no

8 0

3 years ago

Find the calculated value of the rational expression 2x + 6/4x - 8

labwork [276]

Answer:

Step-by-step explanation:

To calculate the value of the given rational expression (2x + 6) / (4x - 8), it is a good idea to simplify it first.

To simplify this expression, we can take the common out of both, the numerator and the denominator, as shown:

From the term 2x + 6, we can take out 2 as the common and from 4x-8, we can take 4 as common so the terms will become;

2 (x + 3) / 4 (x - 2)

2 from the numerator and 4 from the denominator will get cancelled and we will get x+3 / 2(x-2)

so we will solve for x-2 = 0 to get x = 2 which is the excluded value.

7 0

3 years ago