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Olegator [25]
3 years ago
8

-4.75 + (-2.75) + 1

Mathematics
2 answers:
scZoUnD [109]3 years ago
6 0
-6.5 because -4.75 + (-2.75) + 1 =
-3.75 -2.75 which is equal to -6.5
Ket [755]3 years ago
4 0

Answer:

-6.5

Step-by-step explanation:

You might be interested in
A missile is launched from the ground. Its
Softa [21]

Answer:

The height of the missile in the air after 11 seconds is 330 feet.

Step-by-step explanation:

The standard form for the quadratic function f(x)= , which is the function of the parabola model.

We are given two points.

(1, 130) and (2, 240)

Here the first coordinate represents the x (time) and the second coordinate represents h(x), which is height.

Now plug these two coordinates and find the two equations.

(1, 130), the equation is

130 = a.(1)^2 + b(1) + c, where "c" is the initial height. Which is equal to zero.

Therefore, we get

130 = a + b + 0

a + b = 130 -------(1)

Now let's form the second equation using the coordinate (2, 240)

240 =

240 = 4a + 2b -------------(2)

Now let's solve the equations (1) and (2) and find the value of "a" and "b"

a + b = 130 can be written as a = 130 - b

Here we can use the substitution method.

Now plug in a = 130 - b in the second equation, we get

240 = 4(130 - b) + 2b

240 = 520 - 4b + 2b

240 = 520 - 2b

2b = 520 - 240

2b = 280

Dividing both sides by 2, we get

b = 140

Now plug in b = 140 in a = 130 -b and find the value of a

a = 130 - 140

a = -10

Now we got a = -10 and b = 140.

We plug in a = -10 and b = 140 in the general form, we gety

h(x) =

Where c is the initial height, which is equal to 0.

h(x) =

Now plug in x = 11 seconds and find the height.

h(11) = -10(11)^2 + 140 (11)

= -10 (121) + 1540

= - 1210 + 1540

h(11) = 330 feet,

Therefore, the height of the missile in the air after 11 seconds is 330 feet

3 0
2 years ago
6. Sue has 18 homework problems. She has 3 times as many problems as John. Which equation shows how many problems John has (j)?
Oksana_A [137]

Answer:

B if thats to divide 18 by 3

Step-by-step explanation:

Sue has 3 times as many problems as John so if she has 18 problems you divide by 3 to get the number of johns problems

5 0
3 years ago
Read 2 more answers
PLEASE HELP ASAP
Leno4ka [110]

Answer:

x=10

Step-by-step explanation:

we know that

If the lines m and n are parallel

then

130\° = (8x+50)\° ----> by corresponding angles

solve for x

8x=130-50\\8x=80\\x=10

7 0
3 years ago
Help, ASAP! Please!!
Yuliya22 [10]

Answer:

a. Parallel

b. Not parallel

Step-by-step explanation:

Systems which have no solutions are parallel lines. These lines do not intersect and therefore have no solution. Remember, parallel lines have the same slope. Compare the slope in each equation when in y=mx+b format to see if they are parallel.

a. y= 2x + 3                                                  y-2x=-3 becomes y = 2x - 3

m = 2                                                            m= 2

The slopes are the same so these are parallel lines.

b. 3x + y = 2 becomes y= -3x + 2               y = 1/3 x + 1/2

m = -3                                                          m= 1/3

The slopes are different so this is not parallel.

Since -3 and 1/3 are the negative reciprocals of each other. These lines are actually perpendicular.

7 0
3 years ago
A random sample of 50 bottles is selected from the production line of a large manufacturing company. The mean weight of the cont
andrew11 [14]

Answer:

The population is all bottles in the production line and the sample is the 50 bottles that were selected.

Step-by-step explanation:

Edge 2020

4 0
3 years ago
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