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Marizza181 [45]
3 years ago
9

Sam will take four science tests this quarter. Her scores on three of the tests are shown below.

Mathematics
2 answers:
GuDViN [60]3 years ago
8 0

Answer:

What are the scores?

Step-by-step explanation:

hodyreva [135]3 years ago
8 0

Answer:

She would have to study harder. :)

Step-by-step explanation:

Have a good day.

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What is the value of y in the equation y − 7 = 21? 7 17 21 28
gulaghasi [49]
Isolate the y

add 7 to both sides

y - 7  = 21

y - 7 (+7) = 21 (+7)

y = 21 + 7 

y = 28

28 is your answer

hope this helps


6 0
4 years ago
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If a = 3, solve the expression 3a + 6 +5a.​
Tanya [424]

Answer:

3a+6+5a

3×3+6+5×3

9+6+15

15+15

30

3 0
3 years ago
If the sales price is 55.50, and the discount is 75%, what is the original price
yaroslaw [1]

Answer:

£74

Step-by-step explanation:

£55.50 = 75%

Find 1% of discounted price by dividing both sides by 75 :

£0.74 = 1%

Using 1%, multiply by 100% to find original price :

£74 = 100%

Check our answer :

£74 × 0.75 (75%) = £55.50 ✅

Hope this helped and brainliest please

4 0
2 years ago
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Find the total surface area
FrozenT [24]

Answer:638

Step-by-step explanation:

7 0
4 years ago
Suppose the demand for a certain item is given by:
Marysya12 [62]

Answer:

a. D'(p) = -10p - 6

b. There is a decrease of 96 units of demand for each dollar increase

Step-by-step explanation:

The demand function is:

D(p) = - 5p^2-6p+400

(a) The derivate of the demand function with respect to price gives us the rate of change of demand:

\frac{dD(p)}{dp}=D'(p) = -10p-6

(b) When p = $9, the rate of change of demand is:

D'(9) = -10*9-6\\D'(9) = -96\ \frac{units}{\$}

This means that, when p = $9,  there is a decrease of 96 units of demand for each dollar increase.

6 0
3 years ago
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