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aleksandrvk [35]
3 years ago
5

What expression can be used to find 4 x 275 using mental math

Mathematics
1 answer:
scoray [572]3 years ago
4 0
1,100 is the answer to 4×275
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5/7=20/r<br><br> R=28<br><br> Can anyone explain how you get 28
Lesechka [4]

Answer:

Step-by-step explanation:

we are given that these two fractions are equal. however, 20/r is just given in numerators and denominators that are four times as large, even though it is still equal to 5/7. we can tell this because 20 is 4 times larger than 5, which means that R must be 4 times larger than 7, right? YES. so we take 7*4 to get 28.

8 0
3 years ago
Determine whether the triangles must be congruent. If so, name the postulate or theorem that justifies your answer. If not, expl
Alona [7]
Problem 16)

We use ASA (angle side angle) to show the two triangles are congruent. Why ASA instead of AAS? Because the single pair of sides are between the two angles. 

--------------------------------------------

Problem 18)

Similar to problem 16, we'll have two pairs of congruent angles, and a pair of congruent sides. However, the sides are NOT between the two angles. So that means we use AAS in this case.
6 0
3 years ago
Select all that have a value of 0. cos 0 sin 0
zhenek [66]
For cosФ×sinФ =0, then either cosФ or sin Ф must be zero. 
       cos 90 = cos 270 = 0
      sin 0 = sin 180 = sin 360 = 0.
So, the values that would give you 0 are:
1. cos 90 sin Ф
2. cos 270sin Ф
3. cos Ф sin 0
4. cos Ф sin 180 and 
5 cos Ф sin 360.

3 0
3 years ago
Read 2 more answers
Enrique has almost unlocked all the bonus points in his new video game. The game says he has earned 150630 of all the possible b
krek1111 [17]
I think It might be B but Im not positive
4 0
4 years ago
Read 2 more answers
The world brand of rivet placement is 11209 rivets in 9 hours and belongs to J. Mair of Ireland. If another person places 11209
Ilya [14]

Answer:

4.74 hours

Step-by-step explanation:

Given that both person have to place same number of rivets that is

11209

first person take 9 hours to complete the work

hence 1 hour work of 1st person is \frac{1}{9} of total work

second person takes 10 hours to complete the same work

hence 1 hour work of 2nd person is \frac{1}{10}

Now if both work together then

1 hour work of both person = \frac{1}{9} +\frac{1}{10} =\frac{19}{90}

thus working together they need \frac{90}{19} hours = 4.74 hours to complete the whole work which is placing 11209 rivets  

5 0
3 years ago
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