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2 years ago

Write an iequality for -5(×+7)<-10 representing the solution for x

Mathematics

1 answer:

vovikov84 [41]2 years ago

3 0

Answer:

X<-5

Step-by-step explanation:

1) open the brackets

2) take -35 to the other side with -10

where it turns to be -5X<-10+35

3) work out to find -5X<25

4) divide both sides by -5

to find X<-5

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Brian can lay a slab of concrete in 6 hours, while Greg can do it in 4 hours. If Brian and Greg work together, how long will it

anastassius [24]

Answer:

2 2/5 hours

Step-by-step explanation:

In 6 hours Brian can lay 1 slab of concrete

dividing both side by 6

in 6/6 hours Brian can lay 1/6 slab of concrete

Thus, in 1 hour Brian can lay 1/6 slab of concrete

In 4 hours Greg can lay 1 slab of concrete

dividing both side by 4

in 4/4 hours Greg can lay 1/4 slab of concrete

Thus, in 1 hour Greg can lay 1/4 slab of concrete

Thus, total part of slab laid by both in 1 hour when they work together

1/6 + 1/4 = 4+6/(6*4) = 10/24 = 5/12

5/12 of slab of concrete is laid by both of them in 1 hour

time taken to lay 5/12 of slab = 1 hour

dividing both side by 5/12

time taken to 5/12/ 5/12 of slab = 1/5/12 hour = 12/5 hours

time taken to 1/1 of slab = 12/5 hours = 2 2/5 hours

Thus,

it takes 2 2/5 hours to lay the full slab of concrete when Brian and Greg work together,

5 0

3 years ago

Which elephants weight is 2.86 tons when rounded to the nearest hundredth.

Naily [24]

Answer:

An elephant

Step-by-step explanation:

2.86 tons is the weight of an elephant.

5 0

3 years ago

What might weigh 20 kg?

KatRina [158]

The heavy suitcase.

A small car would still weigh quite a lot, a tablet would weigh a lot less than that, and a watermelon is around 2kg (depends).

7 0

2 years ago

Read 2 more answers

Solving two-step equations:

aleksklad [387]

Answer:

Mia scored 6 baskets Last Saturday.

Step-by-step explanation:

Let:

Mia made score of baskets on Last Saturday = x

Mia made score of baskets yesterday = 3x (Mia made three times as many baskets in yesterday’s basketball game as she did last Saturday. three times means multiply 3 with score of Last Saturday baskets, i.e. x)

Total score of baskets = 24

We need to find How many baskets did Mia score last Saturday?

We can write:

<em>Total Score = Score on Last Saturday + Score yester</em>day

$24=x+3x$

Solving this equation we can find value of x:

$24=x+3x\\24=4x\\=>4x=24\\x=\frac{24}{4}\\x=6$

So, we get value of x = 6

Mia made score of baskets on Last Saturday = x = 6

Mia scored 6 baskets Last Saturday.

4 0

2 years ago

Solve the system by substitution<br> -4.5x-2y=-12.5<br> 3.25x-y=-0.75

gogolik [260]

Answer:

The answer to your question is: x = 1, y = 4

Step-by-step explanation:

I'll change decimals to fractions

4.5 = 9/2

12.5 = 25/2

3.25 = 13/4

0.75 = 3/4

-9/2 x - 2 y = - 25/2 (I)

13/4 x - y = - 3/4 (ll)

Process

from (II) y = 13/4x + 3/4

Sunstitution -9/2x -2(13/4 x + 3/4) = - 25/2

-9/2 x - 13/2 x - 3/2 = -25/2

Multiply by 2 -9 x - 13 x - 3 = -25

-22 x = -25 + 3

-22 x = -22

x = 22/22

x = 1

y = 13/4 (1) + 3/4

y = 16/4

y = 4

7 0

3 years ago

Write an iequality for -5(×+7)<-10 representing the solution for x​

Write an iequality for -5(×+7)<-10 representing the solution for x