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djyliett [7]
3 years ago
15

A brick measures 30 cm × 10 cm × 7 1/2. How many bricks will be required for a wall 30 m long. 2 m high and 3/4 m thick?

Mathematics
1 answer:
Olenka [21]3 years ago
5 0

Answer:

the answer is 45

Step-by-step explanation:

all you have to do is multiply 30*2*3/4

to get 45

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2) -7x + 5y=10<br> 4x - 5y=-10
bezimeni [28]
To solve this, the problem is solvable by elimination. So you see how the 5y and -5y cancel out? You basically add those two and you add the -7x and 4x and 10 and -10 leaving you with -3x=0. Dividing by each side gives you x=0. Then, plug 0 in for x in -7x+5y=10. Giving you

-7(0)+5y=10.

0+5y=10

5y=10
Divide by 5 on each side giving you y=2. So your answer is (0,2).

5 0
2 years ago
Read 2 more answers
A trucker handed in a ticket at a toll booth showing that in 2 hours she had covered 159 on a toll road with a posted speed limi
Nimfa-mama [501]

Answer:

overspeeding,

see if we calculate the speed or average speed,

it would be 159/2 which would be 79.5mph,

so as posted speed was 65mph, but the average speed was 79.5mph(Meaning most of the time she would have been above 65 mph), So,

She would have been charged with overspeeding

HOPE IT HELPS

BYE!

4 0
2 years ago
I will upvote and give brainliest answer
grigory [225]

Answer:

The answer is 67 degrees.

Step-by-step explanation:

The angle x is supplementary with 23 degrees because that angle is an alternate interior. Recall that is within a right angles as well so

90 - 23 = 67

7 0
3 years ago
Read 2 more answers
The heat index I is a measure of how hot it feels when the relative humidity is H (as a percentage) and the actual air temperatu
PSYCHO15rus [73]

Answer:

a) I(95,50) = 73.19 degrees

b) I_{T}(95,50) = -7.73

Step-by-step explanation:

An approximate formula for the heat index that is valid for (T ,H) near (90, 40) is:

I(T,H) = 45.33 + 0.6845T + 5.758H - 0.00365T^{2} - 0.1565TH + 0.001HT^{2}

a) Calculate I at (T ,H) = (95, 50).

I(95,50) = 45.33 + 0.6845*(95) + 5.758*(50) - 0.00365*(95)^{2} - 0.1565*95*50 + 0.001*50*95^{2} = 73.19 degrees

(b) Which partial derivative tells us the increase in I per degree increase in T when (T ,H) = (95, 50)? Calculate this partial derivative.

This is the partial derivative of I in function of T, that is I_{T}(T,H). So

I(T,H) = 45.33 + 0.6845T + 5.758H - 0.00365T^{2} - 0.1565TH + 0.001HT^{2}

I_{T}(T,H) = 0.6845 - 2*0.00365T - 0.1565H + 2*0.001H

I_{T}(95,50) = 0.6845 - 2*0.00365*(95) - 0.1565*(50) + 2*0.001(50) = -7.73

8 0
3 years ago
What is the area of a circle with a radius of 42 inches?<br> in²<br> (Use 3.14 for Pi.)
TEA [102]

Answer:

Area of circle = π r ^ 2

= 3.14 × ( 42) ^ 2

= 5538.96 in^2

If you need any other help , please let me know ! [ you'll have to pay btw]

3 0
1 year ago
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