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grandymaker [24]
3 years ago
9

You bought a magazine for $5 and some erasers for $4 each. You spent a total of $33. How many erasers did you buy?

Mathematics
1 answer:
Serjik [45]3 years ago
4 0

Answer:7 erasers

Step-by-step explanation: keep the 5 and add 7x4=28 28+5=33

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As part of quality-control program, 3 light bulbs from each bath of 100 are tested. In how many ways can this test batch be chos
hichkok12 [17]

Answer:

<h3>By 161700 ways this test batch can be chosen.</h3>

Step-by-step explanation:

We are given that total number of bulbs are = 100.

Number of bulbs are tested = 3.

Please note, when order it not important, we apply combination.

Choosing 3 bulbs out of 100 don't need any specific order.

Therefore, applying combination formula for choosing 3 bulbs out of 100 bulbs.

^nCr = \frac{n!}{(n-r)!r!} read as r out of n.

Plugging n=100 and r=3 in above formula, we get

^100C3 = \frac{100!}{(100-3)!3!}

Expanding 100! upto 97!, we get

=\frac{100\times 99\times 98\times 97!}{97!3!}

Crossing out common 97! from top and bottom, we get

=\frac{100\times 99\times 98}{3!}

Expanding 3!, we get

=\frac{100\times 99\times 98}{3\times 2\times 1}

= 100 × 33  × 49

= 161700 ways.

<h3>Therefore,  by 161700 ways this test batch can be chosen.</h3>
3 0
3 years ago
Grade 10 math help please show work (30 points) I will mark brainlist too
dybincka [34]

Answer:

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6) cos ∅ = 250/270         (500/2 = 250)

cos ∅ = 0.9259

∅ = 22.19°

4 0
3 years ago
Solve using substitution <br> x-10y=10<br> x= -10
34kurt
-10 -10y = 10
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4 0
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attashe74 [19]
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so the answer is 3/20 of a pizza
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3 0
3 years ago
How do you calculate 15-(37+8)÷3
Lorico [155]
PEMDAS

15-(37+8)/3
15-45/3
15-15
0
5 0
3 years ago
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