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den301095 [7]
3 years ago
10

PLEASE ANSWER THIS QUESTION

Mathematics
1 answer:
Marta_Voda [28]3 years ago
3 0

Answer: 31 is No   35 is Yes    28 is No     36 is Yes

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When adding 3 and -9, how do you know that the sum is negative?
irga5000 [103]
You know the sum is negative because the negative integer is larger than the positive integer.
7 0
3 years ago
What quantity of 75 per cent acid solution must be mixed with a 30 per cent solution to produce 1080 mL of a 50 per cent solutio
Jlenok [28]

Answer: 480 mL, 600 mL

Step-by-step explanation:

Given

The concentration of the first acid is 75%

The concentration of the second acid is 30%

The final mixture has a concentration of 50%

The final volume is 1080 mL

Suppose x and y be the volume of the first and second acid

\therefore x+y=1080\quad \ldots(i)\\0.75x+0.3y=0.5\times 1080\quad \ldots(ii)

Solving the above equations we get

x=480,y=600

So, the quantity of the first acid is 480 mL and 600 mL for the second mixture.  

6 0
3 years ago
Ben has 90 in his saving account. He plans to deposit 36 per week to build his account balance
Gelneren [198K]

Answer:

he will increase his account balance by $20 a year

Step-by-step explanation:

7 0
3 years ago
The radius of a circle is 6 inches. What is the length of a 135-degree arc?
svp [43]
14.14 inches

Convert 135° into radians. 135*2pi/360=3pi/4.
6*3pi/4=18pi/4=9pi/2=14.14

Another viable method is to do 2pi*6*135/360=14.14
8 0
2 years ago
Does anyone know how to answer this question I'm having a lot of trouble with it?
Helen [10]

Answer:

h = \frac{2A}{(b+c)}

Step-by-step explanation:

Formula for the area of a trapezoid is,

Area (A) = \frac{1}{2}(b+c)h

Here b and c are the bases and 'h' is the height of the trapezoid.

2A = 2[\frac{1}{2}(b+c)h]

2A = (b + c)h

\frac{2A}{(b+c)}=h

Therefore, formula for the height of the trapezoid will be,

h = \frac{2A}{(b+c)}

5 0
3 years ago
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