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2 years ago

28) If 60% of A is 30% of B, then B is what percent of A?

Mathematics

2 answers:

GaryK [48]2 years ago

8 0

Answer: 200%

Explanation: 60

katen-ka-za [31]2 years ago

4 0

Answer:

B is 200% of A, therefore correct option is C.

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After breaking your penny bank, you notice that you have $4.87 in quarters ($0.25), dimes ($0.10), nickels ($0.05), and pennies

ira [324]

Answer: Option 'c' is correct.

Step-by-step explanation:

Let the number of dimes be 'x'.

Let the number of nickels be ' $\dfrac{3}{2}x$ '.

Let the number of pennies be $\dfrac{3}{2}\times 2x=3x$

Let the number of quarters be '3x-34'.

As we know that

1 quarter = $0.25

1 dime = $0.10

1 nickel = $0.05

1 penny = $0.01

According to question, we get that

$0.10x+0.05\times \dfrac{3x}{2}+0.01\times 3x+0.25(3x-34)=4.87\\\\0.10x+0.075x+0.03x+0.75x-8.5=4.87\\\\\\0.955x=4.87+8.5\\\\0.955x=13.37\\\\x=\dfrac{13.37}{0.955}\\\\x=14$

So, the number of pennies is given by

$3x=3\times 14=42$

Hence, Option 'c' is correct.

3 0

2 years ago

Simple volume problem!

Stels [109]

The answer is b 6 hope this helped you

4 0

3 years ago

9 percent of 1000 is....

Fiesta28 [93]

0.9 ..............................

8 0

3 years ago

Need help with question a

SVEN [57.7K]

Answer:

1.8 cm

6.3 cm²

Step-by-step explanation:

AC⊥BC

BD=BC=x

(x+5)²+x²=7²
x²+10x+25+x²=49
2x²+10x- 24=0
x²+5x-12=0
x=1.8

BC= 1.8 cm

Area of ABC= 1/2*1.8*7= 6.3 cm²

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3 years ago

How to rewrite the function 2x^2-7x+5 by completing the square

larisa [96]

First you find two numbers that when you multiply they'll equal 5 then when you add or subtract, they'll equal -7

(x-1)(2x-5)

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3 years ago