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Shtirlitz [24]
3 years ago
12

If y is directly proportional to x and y=5 when x=2, find the value of y when x =7​

Mathematics
1 answer:
Amanda [17]3 years ago
3 0

Answer:

y = 17.5

Step-by-step explanation:

y = kx

→ Substitute in the values

5 = 2k

→ Divide both sides by 2 to isolate k

k = 2.5

⇒ y = 2.5x

→ Substitute in x = 7

y = 2.5x ⇔ y = 2.5 × 7 ⇔ y = 17.5

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Find the equivalent exponential expression.<br> (4^2)4
steposvetlana [31]

Answer:

4^8

Step-by-step explanation:

If the second 4 is an exponent, as in (4^2)^4, then multiply the exponents.

(4^2)^4 = 4^(2 * 4) = 4^8

3 0
3 years ago
Can someone make my day and please help me solve number 3?
olga nikolaevna [1]
X = cost of car before tax

Total cost = (cost of car before tax) + (tax amount)
Total cost = x + 5% of x
Total cost = x + 0.05x
Total cost = 1.05x

The total cost is given to be $14,512, which means 

<span>Total cost = 1.05x = 14512
</span>
1.05x = 14512
1.05x/1.05 = 14512/1.05
x = 13,820.95238
x = 13,820.95

The total cost of the car before tax, to the nearest cent, is $13,820.95
6 0
3 years ago
Quadrilateral ABCD is similar to quadrilateral EFGH the length of the three longest side in quadrilateral ABCD are 24 feet 16 fe
Triss [41]
Check the picture below

solve for "x"

since we know the two smallest sides for EFGH are 9 and 18, 9 is the smallest of all, and 18 is the next small

thus, for the the quadrilateral ABCD, the smallest is "x" and the next small is given, is 12, since that's smaller than 16 or 24

5 0
3 years ago
How long will it take 4000 to grow to 9000 if it is invested at 7% compounded monthly
NARA [144]
1.5 years, or 18 months.
4 0
3 years ago
Alice sold candy for a school fundraiser. Chocolate bars sold for$2.25 a piece, bags of chocolate covered peanuts sold for$1.85
Rzqust [24]

Answer:

12 bags

Step-by-step explanation:

2.25 × 9 = 20.25

.50 × 10 = 5

20.25 + 5 = 25.25

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22.2 ÷ 1.85 = 12

8 0
3 years ago
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