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blondinia [14]
3 years ago
9

Which equation can be used to find 42*51

Mathematics
2 answers:
german3 years ago
5 0

Answer:

(40 x 50) + (40 x 1) + (2 x 50) + (2 x 1) = 2,000 + 40 + 100 + 2

Step-by-step explanation:

I did some research and used a calculator.

Plz click the Thanks button!

<Jayla>

jenyasd209 [6]3 years ago
3 0

Answer:

multiplication

Step-by-step explanation:

The * sign is multiplication. When you have no multiplication sign on your keyboard, you use *. Hope this helps! If you are still confused please comment.

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Tcecarenko [31]
9:8 is the equivalent ratio
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3 years ago
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Sally bought some candy bars for $1.25 each and some sodas for $1.49 each. If she bought a total of 38 items and spent $50.38 ho
hammer [34]

Answer:

26 candy bars and 12 sodas

Step-by-step explanation:

This problem can be solved by a simple system of equations

I am going to call x the number of candy bars that Sally bought and y the number of sodas that Sally bought.

The fact that she bought 38 itens means the x + y = 38.

She spent $50.38. The value she spent is the sum of the number of candy bars multplied by the value of the candy bar and the number of sodas multiplied by value of a soda. So 1.25x + 1.49y = 50.38

So we have to solve the following system:

1)x + y = 38

2)1.25x + 1.49y = 50.38

From 1), we have that x = 38 - y. I am going to replace it in 2)

1.25(38-y) + 1.49y = 50.38

-1.25y + 1.49y = 50.38 - 47.5

0.24y = 2.88

y = 12.

Sally bought 12 sodas.

In 1: x = 38-y = 38-12 = 26

Sally bourght 26 candy bars

6 0
3 years ago
Read 2 more answers
How do I get the result of x + 3y = -3
kakasveta [241]
I don’t know but I’m ganna keep typing because I need 20 letters
8 0
3 years ago
Given tan of theta = -2 and pi/2; find cos(2theta)
Nata [24]

Given tan of theta = -2 and pi/2; find cos(2theta)
The identity of cos (2 theta)= cos(2\theta )=\frac{1-tan^2\theta }{1+tan^2\theta }
Given tan of theta = -2 and pi/2.
So, let's plug in tan theta= -2
cos(2\theta)= \frac{1-(-2)^2}{1+(-2)^2}
=\frac{1-4}{1+4} (Squaring)
=\frac{-3}{5} (simplifying)
So, cos ( 2 theta) = -3/5.
Now we can plug in tan theta = π/2
cos(2\theta)= \frac{1-(π/2)^2}{1+(π/2)^2}
= \frac{1-pi^2/4}{1+pi^2/4} (Squaring)
=\frac{4-pi^2}{4+pi^2} Simplifying
So, cos ( 2 theta)= -3/5 and (4-pi^2)/(4+pi^2)

5 0
4 years ago
Read 2 more answers
Prove the identity cos(x-y)-cos(x+y)=2sinxsiny
tekilochka [14]

Answer:

see the procedure

Step-by-step explanation:

we know that

cos(X - Y) = cosX cosY + sinX sinY\\cos(X + Y) = cosX cosY - sinX sinY

so

cos(X - Y)-cos(X + Y)=cosX cosY + sinX sinY-(cosX cosY - sinX sinY)

cos(X - Y)-cos(X + Y)=cosX cosY + sinX sinY-cosX cosY + sinX sinY

cos(X - Y)-cos(X + Y)=sinX sinY+ sinX sinY

cos(X - Y)-cos(X + Y)=2sinX sinY ----> is verified

7 0
3 years ago
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