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Crank
3 years ago
14

Evaluate the expression when x=-2 and y=2. -9x+y X 5 ?

Mathematics
1 answer:
marissa [1.9K]3 years ago
8 0

Answer:

100

Step-by-step explanation:

(-9x+y) *5

Let x = -2 and y = 2

(-9 *-2+2) *5

Parentheses first

(18+2) * 5

(20)*5

100

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2 years ago
Geometry math question no Guessing and Please show work
WITCHER [35]

Answer: Choice A) 15 feet

=====================================

x = length of fourth side in quadrilateral ABCD

Have a look at the attached image I've posted. I made a chart that lines up the side lengths from largest to smallest. Note how the first two items in the bottom row are blank. We don't know these values and we don't need to find out in order to find x.

Based on the last two columns of that table, we can form the proportion below, which is then used to isolate x.

30/12 = x/6

30*6 = 12*x ... cross multiply

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5 0
3 years ago
If two sweaters and four shirts cost $150, and four sweaters and three shirts cost $200, find the price of each shirt and each s
STALIN [3.7K]

Answer:

shirt = $20

sweater = $35

Step-by-step explanation:

This question would be solved using simultaneous equation

Let the price of sweater be represented by a

Let the price of shirt be represented by b

The following equations can be derived from the question

2a + 4b = 150   equation 1

4a + 3b = 200   equation 2

Multiply equation 1 by 2

4a + 8b = 300    equation 3

Subtract equation 2 from 3

5b = 100

divide both sides of the equation by 5

b = 20

substitute for b in equation 1

2a + 4(20) = 150

2a + 80 = 150

collect like terms

2a = 150 - 80

2a = 70

divide both sides by 2

a = 35

Price of sweater = $35

Price of shirt = $20

4 0
2 years ago
Read 2 more answers
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