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natali 33 [55]
3 years ago
13

I WILL GIVE BRAINLIEST IF YOUR ANSWER IS CORRECT

Mathematics
1 answer:
telo118 [61]3 years ago
6 0

Answer:

1. 4.5 g

2. 56.25 g

Step-by-step explanation:

3 % substance solution means :

3 g of dry substance is present in 100 g of solution.

By unitary method:

The weight of dry substance in 1 g of solution = \frac{3}{100}

The weight of dry substance in 150 g of solution = \frac{3}{100}\times150=4.5\ g

Let the weight of solution be w.

8 % solution contains 8 g dry substance in 100 g.

We have to find the weight of the solution(w) which contains 4.5 g of dry substance.

⇒ \frac{8}{100}\times w=4.5\\w=\frac{450}{8}=56.25\ g.

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Someone please help me
Cloud [144]

Answer:

r=12

Step-by-step explanation:

Look, we can reverse the problem to get 23-11=r. This means that r=12.

6 0
3 years ago
Read 2 more answers
A tree in leilas backyard has been growing for 3 1/5 years. It is 3/4 meters tall how many meters per year?
IgorC [24]

Answer:

The tree grew 15/64 meters per year.                  

Step-by-step explanation:

Given

  • Length of a tree = 3/4 meters
  • Total time taken by the tree to grow 3/4 taller = 3 1/5 or 16/5 years

To determine

Per year growth of the tree in meters

Per year growth of the tree in meters can be determined by dividing the total length of a tree i.e. 3/4 meters by the total time taken by the tree to get 3/4 taller.

Per year growth of tree = Total Length  / Total time to grow

                                       = 3/4 ÷ 16/5

                                        = 3/4 × 5/16

                                        = [3×5] / [4×16]

                                        = 15/64 meters

Therefore, the tree grew 15/64 meters per year.                  

4 0
3 years ago
Fill in the blanks
katen-ka-za [31]
1 - 9
2 - 87
3 - -2
4 - -9
that’s the answers for them :), have a great day !! :)
5 0
3 years ago
Let x and y represent two real numbers. Write an algebraic expression to denote the quotient obtained when the product of the tw
sertanlavr [38]
(xy)/(x+y) hope this helps
5 0
3 years ago
The height 'h' (in feet) of a ball in a baseball game can be modeled by h = -16t² + 28t + 8 , where 't' is the time (in seconds)
lidiya [134]

Answer:

  a)  No. t < 0 is not part of the useful domain of the function

  b) 2.0 seconds

Step-by-step explanation:

a) A graph of the function is shown below. It shows t-intercepts at t=-0.25 and t=2.0. We presume that t is measured forward from some event such as the ball being thrown or hit. The model's predicted ball location has no meaning prior to that event, when values of t are negative.

__

b) It is convenient to use a graphing calculator to find the t-intercepts. Or, the equation can be solved for h=0 any of several ways algebraically. One is by factoring.

  h = 0 = -16t² +28t +8 . . . . . . . . . . . . the ball hits the ground when h = 0

  0 = -4(4t² -7t -2) = -4(4t +1)(t -2)

This has t-intercepts where the factors are zero, at t=-1/4 and t=2.

The ball will hit the ground after 2 seconds.

4 0
3 years ago
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