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3 years ago

12

Which expression is equivalent to 4 − (−7)? A 7 + 4 B 4 − 7 C −7 − 4 D −4 + 7

2 answers:

jeyben [28]3 years ago

6 0

Answer:

A.7+4

Step-by-step explanation:

4-(-7)

b/c negative times negative is postive

-(-)=+

-(+)= -

+(+)=+

hope it's helpful

THANK YOU.

ELEN [110]3 years ago

3 0

Answer:

7+4

Step-by-step explanation:

When you are subtracting a negative, you are really adding the number. For example, four minus negative seven is equal to four plus seven.

4 - (-7) = 4+7

4+7 = 7+4 (By the commutive property of addition)

Let me know if this helps!

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Suppose you pick a tile out of a bag containing 26 tiles marked with the letters A through Z. What is the probability of picking

Liula [17]

Given that <span>a bag contains 26 tiles marked with the letters A through Z.

The probability of picking a letter from the name JACK is 4 / 26

The probability of picking a letter from the name BEN is 3 / 26.

Therefore, the probability of picking a letter from the name JACK or from the name BEN iis given by 4 / 26 + 3 / 26 = 7 / 26 </span>

6 0

3 years ago

a store is having a sale in which all items are reduced 20%. Including tax, Jennifer pail $21 for a pair of shorts. If the sales

andrey2020 [161]

Answer:

$25.

Step-by-step explanation:

Let x be the original price of shorts.

We have been given that a store is having a sale in which all items are reduced 20%. The sales tax is 5%.

The price of shorts after 20% off will be:

$\text{ Price of shorts after discount}=x-\frac{20}{100}x$

$\text{ Price of shorts after discount}=x-0.2x$

$\text{ Price of shorts after discount}=0.8x$

Since tax is added after the discount, so the price of shorts after including the tax will be:

$0.8x+(\frac{5}{100}\times 0.8x)$

We are told that including tax, Jennifer paid $21 for a pair of shorts. So we can set an equation as:

$0.8x+(\frac{5}{100}\times 0.8x)=21$

Now let us solve for x.

$0.8x+(0.05\times 0.8x)=21$

$0.8x+0.04x=21$

$0.84x=21$

$\frac{0.84x}{0.84}=\frac{21}{0.84}$

$x=\frac{21}{0.84}$

$x=25$

Therefore, the original price of shorts was $25.

7 0

3 years ago

A cyclist traveled 9 kilometers per hour faster than an in-line skater. In the time it took the cyclist to travel 45 kilometers,

coldgirl [10]

Answer:

18 kmh

Step-by-step explanation:

Given: Speed of cyclist is 9 km/h more than skater´s speed.

Distance covered at the given time by cyclist is 45 km and by skater is 30 km.

Let´s assume the speed of skater be "x"

∴ Speed of cyclist will be $(x+9) km/h$

Remember; time= $\frac{Distance}{speed}$

We know the time taken by both cyclist and skater are same.

∴ we can form an equation to find the speed of skater.

Time taken by cyclist= time taken by skater

⇒ $\frac{45}{(x+9)} = \frac{30}{x}$

Multiplying both side by $(x+9)\ and\ x$

⇒ $45x= 30\times (x+9)$

Using distributive property of multiplication

⇒ $45x= 30x+270$

Subtracting both side by 30x

⇒ $15x= 270$

Dividing both side by 15

⇒ $x= \frac{270}{15}$

∴ $x= 18\ kmh$

Hence, speed of the skater is 18 kmh

6 0

4 years ago

What is the measure of angle A to the nearest degree

ipn [44]

Sin A = 56/75
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4 years ago

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N76 [4]

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Step-by-step explanation:

You would divide 126/2 = 63, to check, you would see if there is a 1:1: ratio between number of redheads and all other student!

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4 years ago