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3 years ago

Given that a = -5, b = 1 and c = -5 work out 2b — Зас

Mathematics

2 answers:

borishaifa [10]3 years ago

5 0

Answer:

-73

Step-by-step explanation:

Well do substitution

2(1)-3(-5)(-5)

Now calculate

2-3(-5)(-5)

2+15(-5)

2+ (-75)

Which is basically

2-75

which would be -73

That would be the final answer: -73

Elza [17]3 years ago

4 0

Answer:

-73

Step-by-step explanation:

Substitute the numbers for letters;

2b — Зас

2(1) - 3(-5)(-5)

Then, proceed to expand the brackets,

2 - 3(25)

2-75

-73

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3 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

Apply the square root principle to solve (x-5)^2-40=0

Nitella [24]

Answer: {5 ± 2√10, 5 - 2√10}

Step-by-step explanation: First isolate the binomial squared by adding 40 to both sides to get (x - 5)² = 40.

Next, square root both sides to get x - 5 = ± √40.

Notice that root of 40 can be broken down to 2√10.

So we have x - 5 = ± 2√10.

To get <em>x</em> by itself, add 5 to both sides to get x = 5 ± 2√10.

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3 years ago

If I bought shoes for 32.30 with 15% off 7%sales tax a 25dollar gift card but had a coupon that was forgotten for 5%off the orig

Otrada [13]

Answer:

$4.37 cash outlay

$29.37 total amount paid, partly with gift card

Step-by-step explanation:

The discount was ...

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So the price to which tax is added is ...

$32.30 -4.85 = $27.45

The amount of tax is 7% of this value, or ...

tax = $27.45 × 0.07 = $1.9215 ≈ $1.92

So, payment is made on the amount ...

$27.45 + 1.92 = $29.37

$29.37 is the total amount paid.

If $25 is paid using a gift card, then the cash outlay is $4.37.

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Usually only a single coupon can be applied to a given purchase. Since the 15% store discount exceeds the amount of the 5% coupon left at home, it makes more sense to claim the 15% store discount and save the 5% coupon for another time.

<em>Alternate interpretation</em>

If, by some magic, both discounts could be applied, then the amount to be paid is $27.65, of which $2.65 exceeds the gift card amount. The calculation proceeds the same way, except that 20% is used instead of 15%.

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3 years ago