Calcule: a) (+9) + (-5) = b) (+3) + (-4) = c) (-8) + (+6) =

Mathematics

2 answers:

nadya68 [22]3 years ago

7 0

a) 9 + -5 = 9-5 = 4

b) 3 +-4 = 3 -4 = -1

c) -8 + 6 = -2

cluponka [151]3 years ago

6 0

I have ued the zero pairs strategy, I hope you are familiar with that! Hope i helped!

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yan [13]

C. If there is 23 people you would multiply x (the price) by 23. Since we know the price the expression is 17 x 23.

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3 years ago

What is a coterminal angle for 130 degrees that’s in between 0 and 360 degrees.

Ymorist [56]

Answer:

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4 years ago

Peter have twice as many stickers as Joe. Joe has 40 more stickers than Emily. They have 300 stickers together. How many sticker

Varvara68 [4.7K]

Answer:

170

Step-by-step explanation:

The given relations can be used to write and solve an equation for the number of stickers Peter has.

<h3>Setup</h3>

Let p represent the number of stickers Peter has. That is twice as many as Joe, so Joe has (p/2) stickers. Joe has 40 more stickers than Emily, so the number of stickers Emily has is (p/2 -40).

The total number of stickers is 300:

p +p/2 +(p/2 -40) = 300

<h3>Solution</h3>

2p = 340 . . . . . . . . . . . . . . add 40, collect terms

p = 170 . . . . . . . . . . . divide by 2

Peter has 170 stickers.

<em>Additional comment</em>

Joe has 170/2 = 85 stickers. Emily has 85-40 = 45 stickers.

We could write three equations in three unknowns. Solving those using substitution would result in substantially the same equation that we have above. Or, such a system of equations could be solved using a calculator's matrix functions, as in the attachment.

p +j +e = 300

p -2j +0e = 0

0p +j -e = 40