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monitta
2 years ago
12

PLEASE HELP! BRAINLIEST! AND EXTRA POINTS

Mathematics
1 answer:
Rom4ik [11]2 years ago
8 0

Answer:

The discount is $0.8d.

Step-by-step explanation:

Given that,

The original cost of Tamara's purchase is d dollars​.

Tamara uses a coupon to save 20% off her purchase at the bookstore.

Discount = 20%

Discount is applied to the original cost.

Discount = d-(20/100)d

Discount = 0.8 d

Hence, the discount is $0.8d.

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step 3: x=-3

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2 years ago
Find a_1 and d for an arithmetic sequence with these terms. a_4=9and a_7=18
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\bf n^{th}\textit{ term of an arithmetic sequence}\\\\&#10;a_n=a_1+(n-1)d\qquad &#10;\begin{cases}&#10;n=n^{th}\ term\\&#10;a_1=\textit{first term's value}\\&#10;d=\textit{common difference}\\&#10;----------\\&#10;n=7\\&#10;d=3&#10;\end{cases}&#10;\\\\\\&#10;a_7=a_1+(7-1)d\implies 18=a_1+(7-1)3\implies 18=a_1+18&#10;\\\\\\&#10;18-18=a_1\implies \boxed{0=a_1}
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Step-by-step explanation:

See attachment

6 0
3 years ago
Covert this into slope-intercept form : 13x - 11y = -12
ICE Princess25 [194]

Solve for y,

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5 0
3 years ago
Read 2 more answers
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