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polet [3.4K]
3 years ago
11

college students are offered a 8% discount on a textbook that sells for $31.50 if the sales tax is 8% , find the cost of the tex

tbook including the sales tax
Mathematics
2 answers:
zhenek [66]3 years ago
8 0
The answer should be $33.99
Mashutka [201]3 years ago
5 0
Step 1. Multiply 31.50 by .08. (31.50)(.08)=2.52

Step 2. Subtract 2.52 from 31.50. 31.50-2.52=28.98

Step 3. Multiply 28.98 by .08. (28.98)(.08)=2.32

Step 4. Add 2.32 to 28.98. 28.98+2.32=31.30
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Answer:

The values of x and y are x = 3 and y = 11

Step-by-step explanation:

The isosceles triangle has two equal sides in length, and its base angles are equal in measures

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→ That means the equal sides are JK and KL

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∵ JK = 8x and KL = 13x - 15

→ Equate them

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→ Add 15 to both sides

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→ Subtract 8x from both sides

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→ Divide both sides by 5 to find x

∴ x = 3

∵ K is the vertex of the ΔJKL

∴ ∠KJL and ∠KLJ are the base angles

∵ The base angles are equal in measures

∴ m∠KJL = m∠KLJ

∵ m∠KJL = 5y - 3

∴ m∠KLJ = 5y - 3

∵ The sum of the measures of the angles of a Δ is 180°

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→ Substitute the measures of the 3 angles in the equation

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→ Add the like terms on the left side

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∴ 10y = 110

→ Divide both sides by 10 to find y

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∴ The values of x and y are x = 3 and y = 11

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