2 years ago

The Sum Of

Mathematics

1 answer:

Talja [164]2 years ago

6 0

Answer:

please right it properly in a straight line.

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A rectangle has an area of 126 m2 and a width of 7 m. What is its length?

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126 divided by 7 equals 18

18 m

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Explanation about Cardinal number Carolyn relation cardinals

nalin [4]

Answer:

Cardinal Numbers

The cardinality of a group represents the number of objects available in that group.

The number of elements or members in a set is the cardinal number of that set. ...

For example, set A = {1, 3, 6, 9, 10, 12, 18}, the cardinal number of set A is 7.

Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

I have a 69 and an 82. The 69 is worth 40% of my grade and the 82 is worth 15%. Can someone tell me my current average grade. Pl

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Step-by-step explanation:

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3 years ago

The parabola y=ax^2+bx-10 passes through the points (4.5,8) and (-2.5, 15). Determine the values of a and b

yuradex [85]

$y=ax^2+bx-10 \\ \\
(4.5,8) \\
8=a \times 4.5^2 + b \times 4.5-10 \\
8=20.25a+4.5b-10 \ \ \ |+10 \\
18=20.25a+4.5b \\ \\
(-2.5,15) \\
15=a \times (-2.5)^2+b \times (-2.5)-10 \\
15=6.25a-2.5b-10 \ \ \ |+10 \\
25=6.25a-2.5b$

The system of equations:
$18=20.25a+4.5b \ \ \ |\times 5 \\
25=6.25a-2.5b \ \ \ |\times 9 \\ \\
90=101.25a+22.5b \\
\underline{225=56.25a-22.5b} \\
90+225=101.25a+56.25a \\
315=157.5a \ \ \ |\div 157.5 \\
a=2 \\ \\
25=6.25a-2.5b \\
25=6.25 \times 2-2.5b \\
25=12.5 -2.5b \ \ \ |-12.5 \\
12.5=-2.5b \ \ \ |\div (-2.5) \\
b=-5 \\ \\
\boxed{a=2} \\ \boxed{b=-5} \\ \boxed{y=2x^2-5x-10}$

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3 years ago