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2 years ago

Someone help me with number 12 please please

Mathematics

2 answers:

lina2011 [118]2 years ago

8 0

Answer:

Step-by-step explanation:

So let’s plug the numbers in!

So that would be

3(-7)-9-8(-3)

=-21-9+24

=-6

So the answer is -6

AleksAgata [21]2 years ago

3 0

you would have to do the numbers and letters firdt and then add them up and then lick an

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The sum of two numbers is 20. When the second number is subtracted from the first number, the difference is 4. Find the two numb

elena-s [515]

Answer:

12 and 8

Step-by-step explanation:

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2 years ago

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Evaluate –10 • x • 5 when x = –1. –50 –15 6 50

Rudiy27

The answer is 50 ! :-)

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2 years ago

Find the un know value diameter= 9.8 circumfrence=? radius=? it is question of pie

Monica [59]

The radius is 4.9 and the Circumference is 9.8π

Step-by-step explanation:

Data:

Diameter = 9.8

Circumference = ?

Radius = ?

Radius

Radius is half of the diameter so radius = $\frac{diameter}{2}$

Radius = $\frac{9.8}{2}$

Radius = 4.9

Circumference

Circumference = 2πr

Circumference = 2π(4.9)

Circumference = 9.8π

Therefore, the radius is 4.9 and the Circumference is 9.8π

Keywords: Circumference

Learn more about circumference at

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3 years ago

joe’s bathroom floor is 5 feet wide and 8 feet long. He will cover the floor with 3-inch square tiles. How many tiles does Joe n

slava [35]

5*8=40

40*12=480

480/30=160

Joe needs 160 tiles.

7 0

2 years ago

If you run for 0.4 hours at 7 mph, how fast should you walk during the next 0.8 hours to have the average speed of 5 mph?

Fantom [35]

Answer:

4 mph

Step-by-step explanation:

The average speed of an object is given by the total distance covered by the time taken:

$v=\frac{d}{t}$

where

d is the total distance covered

t is the time taken

in the first part, the person runs for 0.4 hours at a speed of 7 mph, so the distance covered in the 1st part is

$d_1 = v_1 t_1 = (7)(0.4)=2.8 mi$

Then the distance covered in the second part is $d_2$ , so the total distance is

$d=2.8+d_2$ (1)

The total time elapsed is 0.4 hours (first part) + 0.8 hours (second part), so

$t=0.4+0.8=1.2 h$

So we can write the average speed as

$v=\frac{2.8+d_2}{1.2}$ (1)

We want the average speed to be 5 mph,

v = 5 mph

Therefore we can rearrange eq.(1) to find d2:

$d_2 = 1.2v-2.8 = (1.2)(5)-2.8=3.2 mi$

And therefore, the speed in the second part must be

$v_2=\frac{d_2}{t_2}=\frac{3.2}{0.8}=4 mph$

4 0

2 years ago